October 7th: National & International Days, Celebrations and Observances

Want to make a difference on October 7? Here's what works.

• Swap one regular bulb for an LED. Your electricity costs drop right away - plus it's better for the grid.
• Next time you shop for clothes, check those tiny tags. Cotton marked "sustainable" or "fair trade" puts more money in farmers' pockets.
• Someone make your day easier lately? Leave them a note. It takes two minutes but sticks with them all week.
• Good food choices ripple outward. Toss some kale in your next dish or morning smoothie.
• Pick up the local paper - even a quick scan keeps you in the loop.
• Found a cool earth science fact? Share it at dinner.
• Tonight, hit the lights you don't need. Unplug those gadgets gathering dust.
• Speaking of good deeds - food service workers deserve extra appreciation this week. A short thank-you note means more than you'd think.

In 1963, the U.S., U.K., and Soviet Union took action against nuclear threats. Their treaty stopped testing in air, sea, and space. Within two years, scientists measured a sharp drop in atmospheric radiation.

The Mississippi River made history in 1993. At St. Louis, water thundered past - the volume hit 12 Olympic pools each second. Floodwaters spread through 787 counties, forcing families to abandon their homes.

An unexpected discovery lit up the sky on October 7, 2008. Astronomers tracked a small asteroid, 2008 TC3, for just 20 hours before it streaked across Sudan. Teams later found scattered pieces in the desert sand. These meteorite fragments became known as "Almahata Sitta."

October links five people who changed science and society in unexpected ways.

• John Mitchell's computer work at the Met Office Hadley Centre proved something many suspected: human activity affects climate. His early models set standards for today's IPCC reports.
• Niels Bohr won the 1922 Nobel Prize for explaining how atoms work. During World War II, he quit theorizing about particles. Instead, he helped Jewish scientists escape the Nazis.
• Labor activist Joe Hill wrote raw, honest songs about worker rights. Police executed him in 1915. His famous line still works: "Don't mourn, organize!"
• Harry Kroto wasn't looking for a new type of carbon. He found it anyway. His buckminsterfullerene discovery led to better solar panels and pollution filters. He spent his retirement teaching kids about science.
• Diane Ackerman looks at the world differently. In "A Natural History of the Senses," she explains complex science through personal experience. Her precise details stick in readers' minds.

Each focused on one piece of a larger puzzle. Their work still matters.