May 20th: National & International Days, Celebrations and Observances

This May 20, communities across the country focus on practical environmental steps. While not everyone has time or space to help, even occasional actions matter.

• Plant bee-friendly flowers if you have a yard - marigolds and lavender work well in most soils.
• When berry season hits, farmers often sell fresh-picked fruit for less than supermarket prices.
• Local shelters always run short on dog food and old towels, though money helps most.
• Medical research posts need fact-checking first, but sharing good studies helps cut through misinformation.
• A shallow dish with stones gives thirsty bees safe footing - just remember to refresh the water.
• Climate tracking methods vary by region, so check what scientists near you measure.
• Most farmers' markets have at least one honey vendor. Their prices might run higher than stores, but the quality difference shows.
• Those nature tracking apps take practice to use right, but scientists use the bee photos and location data you submit.

Try what works for your situation. Some weeks you'll do more than others, and that's just realistic.

The scientific world has three reasons to remember May 20th.

• Back in 1570, a skilled mapmaker in Antwerp produced something extraordinary. Abraham Ortelius crafted "Theatrum Orbis Terrarum," filling it with 53 precise maps that set new standards. People paid good money for his work - 30 florins bought the basic version, while 50 florins got you hand-colored maps. Word spread fast. Within forty years, printers had released 42 editions in seven different languages.
• Physics made its own history on this date in 1964. Scientists picked up an unexpected signal - the leftover light from the Big Bang itself. Their instruments showed it at 3.5 Kelvin. Today's more sensitive equipment puts it at 2.725 Kelvin, but that first measurement did what mattered most: it backed up the Big Bang theory.
• The same spring day in 1983 brought medical progress. Two scientists, Barré-Sinoussi and Montagnier, wrote up their latest lab results for Science magazine. They'd found the virus behind AIDS. This breakthrough led to better treatments, and by 2008, their work had earned them the Nobel Prize.

May 20th connects an unlikely group of pioneers who shaped different corners of our world.

• When few even considered the idea, British thinker John Stuart Mill (1806-1873) stood before Parliament demanding votes for women. His practical economic theories guide markets today, and he recognized early on why natural spaces needed protection.
• Francis Raymond Fosberg (1908-1993) found his calling in the Pacific islands. Working for the Smithsonian, he developed new ways to catalog plants and created detailed maps. These tools helped measure what human activity was doing to even the most remote island ecosystems.
• The modest fruit fly led Edward B. Lewis (1918-2004) to remarkable genetic discoveries at Caltech. After years of patient study, his work on genes and growth earned a Nobel Prize. Scientists today regularly draw from his findings about genetic development and environmental impacts.
• Uruguay got an unusual president in José Mujica (1935-). He kept his small farm, lived simply, and put 90% of his salary toward helping others. His time in office brought significant advances in sustainable energy and farming methods.
• Few matched Pedro Trebbau's (1929-2021) knowledge of Venezuelan wildlife. After writing what became the standard reference on local mammals, he established research bases throughout the country. Now his former students carry forward his mission, working to protect South American wildlife across the region.