Category: April 21



    National Rendering Day is on April 21 and we are celebrating by bringing awareness to reducing and eliminating food waste through a process known as rendering.


    North Americans consider roughly 50% of an animal inedible. This leaves a lot of leftover material that ends up as food waste. On National Rendering Day, we learn about how we can eliminate this waste, what rendering means, and why using the rendering process is the smart choice.

    What is rendering? In short, rendering is recycling from that 50% of the animal we don’t eat. Rendering reclaims the otherwise wasted material, such as protein, bone, and fat and even includes used cooking oil (UCO) from restaurants. The rendering process safely, hygienically, and sustainably processes that unused material (the meat we don’t eat) into new products and goods so nothing is wasted. When we render material safely and hygienically, we process the material in a sustainable and safe manner. In addition, we convert what would have been food waste into material for use in new products.

    Rendering demonstrates respect and resourcefulness, especially for the livestock that were raised with care by farmers. In fact, rendering shows respect for the animal itself by using all of the animal. In other words, no part of the animal goes to waste. Additionally, by offsetting the environmental impacts of animal agriculture, rendering shrinks our food production footprint.

    Rendering Process

    The rendering process transforms and upcycles what would have been food waste into safe, clean, and valuable ingredients for countless new goods. Rendering also saves landfill space and recycles 99% of unwanted material. For this reason, people can feel confident knowing they are making a sustainable choice by using items made through upcycling by rendering material. Once the rendering process is complete, the ingredients can be used in sustainable production of new goods. These new goods transform into common everyday items, such as:

    • Safe and nutritious pet food and animal feed.
    • Household and industrial products.
    • Biofuels and Biomass-based diesel.
    • Renewable diesel.

    Eco-Friendly Solution

    Rendering is socially and economically sustainable and supports the three pillars of sustainability–environmental, social, and economic. As a highly environmentally sustainable process, rendering:

    • Reduces food waste.
    • Saves landfill space.
    • Reduces greenhouse gas (GHG) emissions.
    • Reclaims and returns clean water to the environment.
    • Provides countless recycled products.

    Impact on Environment

    According to recent data published in 2020, the U.S. and Canada annually produce more than 62 billion pounds of rendered raw materials. As a result of rendering that material, we can produce approximately 31.4 billion pounds of rendered products each year, keeping it out of landfills.

    The data also reports that rendering reduces greenhouse gas (GHG) emissions by 72% when compared to  petroleum diesels, and reduces fossil fuel use by 80%. In comparison to industrial composting, rendering  avoids at least 90% of the potential GHG emissions. Simply put, rendering is the GHG reduction equivalent of removing approximately 18.5 million cars off the road each year.

    Social and Economic Impact

    Rendering is a financially sound and community-focused industry, offering career stability and a commitment to community support. Socially, the act of rendering food provides thousands of full-time, stable jobs that support families and local communities from coast to coast, especially in rural areas. Most importantly, local jobs stay local because of the raw and perishable nature of the material being rendered.

    Most rendering plants are family owned and operated. Many rendering companies are dedicated and passionate about providing community care and outreach. Renderers also contribute to their neighborhoods and wider communities. From supporting the local little league and fire departments, to helping feed and support those in need, renderers are deeply rooted in social sustainability and community support.

    Plant owners invest a considerable amount of time and money to improve and enhance their sustainability efforts. This dedication ensures their facilities remain as climate smart and environmentally responsible as possible.


    • Encourage rendering in your community.
    • Learn important facts about rendering and the important impact it has on the environment.
    • Encourage friends and neighbors to support rendering efforts in their communities.
    • Listen to The Invisible Industry podcast to grow awareness and appreciation for rendering’s important contributions to sustainability and reduced food waste.
    • Share your rendering support on social media using #NationalRenderingDay and tagging a renderer you know.


    National Day Calendar and the North American Renderers Association (NARA) are happy to announce National Rendering Day to be celebrated each year on April 21. This day has been created to show appreciation for those in the rendering industry. The date was intentionally chosen to be near Earth Day to remind everyone the importance of rendering in the larger sustainability and reduced food waste conversations. Today, we encourage everyone to recognize and celebrate the many environmental benefits of rendering, including the  important role in reducing food waste and overall sustainability.

    The North American Renderers Association (NARA) is an alliance that represents the best interests of its members in public, government, and regulatory affairs. The organization provides services, programs, and technical support to the North American rendering industry, both in the national and international markets. Their vision is to deliver sustainable solutions to food, feed, fuel, oleochemical, and other customers. NARA advocates for a sustainable food chain, public health, and the environment through the production and marketing of their members’ products and services.

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    National Clean Out Your Medicine Cabinet Day occurs annually on the third Friday in April. The day aims to raise awareness and effectively rid homes of unused or expired prescription and over-the-counter medications sitting in medicine cabinets, nightstands, or kitchen cabinets that have the potential for misuse or abuse by family members, friends, or visitors.


    How to Do It Right

    How you dispose of your expired or unused medications is just as important as why. Environmental studies show that flushed medications flow into our water supply. They negatively impact the fish we eat and the water we drink. When discarded in the trash, medications leach into and contaminate the soil.

    At-home drug disposal solutions offer a simple, convenient and effective way of disposing of unwanted medications. If you have large quantities of leftover medications or as a supplement to at-home drug disposal, you may also consider participating in the Drug Enforcement Agency’s (DEA’s) National Drug Takeback Day generally held in the spring and fall of each year.


    • Take time during National Clean Out Your Medicine Cabinet Day to help remove your home of risks associated with leftover medications and do your part to help fight drug addiction.
    • Review your medications—as well as those of your pets—wherever you store them.
      • Medicine cabinet
      • Nightstand
      • Kitchen cabinets.
    • Then easily and effectively dispose of any leftover or expired medications by using an at-home disposal solution like DisposeRx.
    • We encourage you to post photos on social platforms of your cleanups using the hashtag #CleanOutMedsDay.
    • Supporting graphics and a video that can also be shared can be downloaded here.


    DisposeRx founded National Clean Out Your Medicine Cabinet Day in 2019 to raise awareness of the risks associated with keeping leftover or expired prescription or over-the-counter medications in your home. Drug addiction, overdose, poisonings, and deaths related to leftover medications are real. DisposeRx provides a simple and effective way to dispose of expired and unused medications that is easy to use and eco-friendly.

    The Registrar at National Day Calendar proclaimed National Clean Out Your Medicine Cabinet Day to be observed annually on the third Friday in April.

    Medicine FAQ

    Q. What is the best way to store medicine?
    A. Medicines best maintain their potency under ideal conditions. Medications should be stored in cool, dry, dark places.

    Q. Does the potency of a medication decrease over time?
    A. Yes. Though, the amount of deterioration will depend on the medication and how it was stored. Some medications increase in potency over time.



    April 21st honors National Yellow Bat Day. On this day in 1967, the Army activated the 265th Army Security Agency Company (Airborne) with the 101st Airborne Division at Fort Campbell, Kentucky.


    The official insignia of the 265th is a bat with outstretched wings on a full moon rising with the motto Through the Night below. Symbolically, the bat represents mystery and secrecy due to its nocturnal nature. The bat fittingly describes the intelligence support provided by the Army Security Agency Battalion.

    Before deploying, the personnel painted all the military vehicles and equipment with a yellow bat. The symbol made the equipment clearly visible from a distance and aided in identifying all unit equipment.

    On November 19th of the same year, they deployed to Vietnam with the designation 265th Radio Research Company (Airborne) to provide intelligence support to the 101st Airborne Division. Arriving a few weeks ahead of the Viet Cong Tet Offensive, they soon learned of the North Vietnamese campaign. However, few commanders would believe the intelligence.

    Tet Offensive

    January 31st on the Vietnamese calendar, Tet, celebrates the lunar new year and is considered a most important holiday. During the conflict between North and South Vietnam, a long-standing informal truce took place every year on Tet.

    General Vo Nguyen Giap, commander of the North Vietnamese, prepared to ring in the lunar new year with a series of coordinated attacks, breaking the informal truce.

    Doug Bonnot, who was assigned to the 265th RRC (ABN) Operations NCOIC in the spring of 1970 and author of The Sentinel and the Shooter, says, “The offensive would come as a surprise to many, but personnel of the 265th RRC (ABN) were manning their sector defensive perimeter of Bien Hoa Air Base, along with the very few small units that believed their intelligence reports, some 12 hours before the Tet Offensive was launched.”

    The Viet Cong never breached these positions, and the Battle Flag of D: 275th Viet Cong Battalion hangs in the Sentinel Museum today.

    As a mobile museum, The Sentinel Museum provides insight into the Vietnam conflict. It also increases awareness of the contributions of the 265th Radio Research Company. Since the 265th’s activities were highly classified, these honorable men’s sacrifices remained cloaked in secrecy until decades after the end of the war. Even today, the general public remains unaware of these men who worked in the shadows providing silent and ceaseless support to the infantry soldier during the Vietnam War. The Yellow Bat symbolizes their secrecy and their service through the night.


    While the Tet Offensive happened more than 50 years ago, the Yellow Bat’s history lives on. You can continue to learn more about these service members and the 265th Army Security Agency Company (Airborne). You can also recognize this day in several other ways:

    • Take some time to learn more about the Vietnam War and those who served.
    • Read about the Tet Offensive about the 265th.
      • The Sentinel and the Shooter by Douglas W. Bonnot
      • The Tet Offensive 1968 Battle Story by Andrew Rawson
    • Honor those who served during a contentious time in our country
    • Tour the Vietnam Veterans Memorial
    • Volunteer for a veteran’s organization

    Be sure to invite family and friends to take the journey with you by using #NationalYellowBatDay to share on social media.


    In 2016, Doug Bonnot, President of the Sentinel Chapter of the 101st Airborne Association, submitted National Yellow Bat Day. He and the chapter members all served with the 265th RRC (ABN).

    The Registrar at National Day Calendar proclaimed National Yellow Bat Day to be observed on April 21st, annually. For more information on National Yellow Bat Day or the Sentinel Chapter of the 101st Airborne Association, please write to Sentinel Chapter, PO Box 205, Telford, TN 37690.

    Yellow Bat FAQ

    Q. How many people served during the Vietnam War?
    A. Approximately 500,000 U.S. military personnel served during the Vietnam War.

    Q. How long did the war span?
    A. The U.S. entered the war in 1965 and remained in Vietnam for eight long years, withdrawing the last military units on March 29, 1973.



    National Chocolate-Covered Cashews Day is observed each year on April 21st. Not unlike other nuts, cashews and chocolate get along well together. Of course, chocolate lovers savor the combination of nutty crunch and creamy, rich chocolate. 


    The cashew is a tree from the family Anacardiaceae.  Its English name comes from Portuguese for the fruit of the cashew tree “caju.”  Originally native to Northeastern Brazil, cashew trees are now widely grown in tropical climates for their cashew fruit and nuts.

    With leaves arranged spirally and a leathery texture, the evergreen cashew tree grows up to 32 feet tall. It also often grows with an irregularly shaped trunk. The buds produce small flowers that start pale green and turn reddish, each having five slender, acute petals.

    Surprisingly, the cashew nutshell is toxic, so producers shell the cashew before selling it to consumers. While many people enjoy the cashew nut for its delicious buttery flavor on its own, adding chocolate makes it even more enjoyable. It makes a great gift during the winter holidays. However, people enjoy chocolate-covered cashews all year long. 


    • Celebrate with a handful of chocolate-covered cashews.
    • They make terrific party snacks. Add them to trail mix or keep a dish of them by your desk to ward off the mid-day munchies.
    • Share your favorite recipes and bring the finished product to share.
    • Use #ChocolateCoveredCashewsDay to share on social media.


    National Day Calendar continues to research the origins of this chocolate and nut holiday.

    Chocolate Covered Cashew FAQ

    Q. How long do cashew trees live?
    A. On average, a cashew tree can live up to 60 years, but some live even longer. According to Guinness World Records, the world’s largest cashew tree is estimated to be over 100 years old.

    Q. How many years does it take for cashew trees to reach maturity and begin producing nuts?
    A. A cashew tree begins producing around three years after its planted, but peak, harvestable production may take up to 8 years.

    Q. Does chocolate make a good gift?
    A. Yes! You can give a variety of chocolate, too. That way you’re more likely to give someone their favorite kind. However, please remember to not give dark or milk chocolate to someone who is allergic to it. White chocolate is the safer option.

    Q. Can you make milk from cashews?
    A. Those with lactose intolerance, milk allergies, or are vegetarian or vegan rely on nut milk for nutrition. Some people prefer the flavor, too. Cashew milk is another option to add to the growing list of available nut and grain milk out there. You can even make it at home.




    Each year on April 21st, National Kindergarten Day honors the birthday of the man who started the first Kindergarten. Friedrich Wilhelm August Fröbel (April 21, 1782  – June 21, 1852) is credited with starting the very first Kindergarten in Germany in 1837. Frobel was a German teacher and a student of Johann Pestalozzi. Frobel laid a foundation for modern education, recognizing that children learn through play and experience.


    The first kindergarten (which means garden for the children) was developed in Blankenburg, Germany, in 1837. The kindergarten fostered Frobel’s social experience for children. It also allowed them to smoothly transition from home to school.

    Eventually, the Prussian government banned Frobel’s unorthodox methods. However, the rest of the world was eager to accept Frobel’s idea of kindergarten, including the United States.

    In 1856, Watertown, Wisconsin, opened the first kindergarten in the United States. Founded by Margarethe Schurz, this kindergarten was a German-language class, as were many in this region. Kindergarten found its way into private English-speaking institutions across the country. However, it wasn’t until 1873 that it became part of any public school system.

    National Kindergarten Day offers an opportunity to thank a kindergarten teacher you know. There are several ways to celebrate the day, too!


    • Recognize an outstanding kindergarten teacher.  
    • Explore a career in elementary education, specifically as a kindergarten teacher.
    • Learn more about elementary education.
    • Donate to a teacher’s supply fund.
    • Share your experiences as a kindergarten teacher.
    • Invite families to see how today’s students learn.
    • Spend a day in a classroom.
    • You can also visit the National Day Calendar Classroom for projects and ideas to help you Celebrate Every Day.
    • Share your kindergarten memories using #NationalKindergartenDay on Social Media.


    National Kindergarten Day honors the day Friedrich Wilhelm August Fröbel was born on April 21, 1782. However, we were unable to identify the founder of National Kindergarten Day.  

    Kindergarten FAQ

    Q. Do kindergarten classes run half days or full days?
    A. Most kindergarten classes today operate full days five days per week. However, in the past, the programs ran half days.

    Q. How old are children when they begin kindergarten?
    A. Most children begin kindergarten the year they turn five. However, children who are born later in the year often wait until the following year to begin. Schools provide parents with age guidelines.

    April 21st Celebrated History


    President John F. Kennedy opens the Seattle World’s Fair via remote control from Palm Beach, Florida. The central feature of the fair was the 600 foot tall Space Needle. It included a revolving dining room and 360-degree viewing.


    Based on the comic strip “Little Orphan Annie” by Harold Gray, Annie debuts on Broadway. Peter Howard directs the award-winning musical. It won seven Tony Awards including Best Musical and Best Original Score.


    Chinese students protested in Tiananmen Square in Beijing. The demonstrations called for democracy, free speech, and a free press from the Chinese government. The protest led to mass demonstrations and the Chinese government declared martial law.

    April 21st Celebrated Birthday

    Friedrich Wilhelm August Fröbel – 1782

    The German student of Johann Pestalozzi is credited with laying the foundation for the modern kindergarten in Blankenburg, German.

    Charlotte Bronte – 1816

    In 1847, the English novelist published her most notable work, Jane Eyre.

    John Muir – 1838

    The naturalist and preservationist is best known for co-founding the Sierra Club. Through his efforts, natural treasures such as Yosemite, Sequoia, the Grand Canyon, and Mt. Rainier are protected as national parks.

    Dorothy Baker – 1907

    Author Dorothy Baker wrote three novels in her lifetime earning her a Houghton Mifflin Literary Fellowship and a Guggenheim Fellowship.

    Queen Elizabeth II – 1926

    On February 6, 1952, Elizabeth II succeeded her father King George VI following his death. She has four children; Charles, Prince of Wales, Anne, Princess Royal, Prince Andrew, Duke of York, and Prince Edward, Earl of Wessex. She is the longest-reigning British monarch.