siyyum

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February 29, leap day, leap year, happens every four years

Leap Day, February 29

Candles Burning On Table In Church

What Is the Most Widely Practiced Religion in the World?

Calendar marking march 15th

22 Questions About Time and Timekeeping Answered

Ancient Mayan Calendar

Our Days Are Numbered: 7 Crazy Facts About Calendars

Shofar, Thalit, Torah, Judaism, yom kippur

Discover

Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere

Why Do Some Cicadas Appear Only Every 17 Years?

Shadow of a man holding large knife in his hand inside of some dark, spooky buiding

7 of History's Most Notorious Serial Killers

Poker game. Card game. Royal Flush in poker. Hearts suit gambling

Poker Hands Ranked

Drinking water is poured into a glass.

Water Fluoridation: Just the Facts

Berries and leaves of the bittersweet nightshade (Solanum dulcamara) plant. Poisonous plant

7 of the World’s Deadliest Plants

Portrait of a mountain gorilla at a short distance. gorilla close up portrait.The mountain gorilla (Gorilla beringei beringei)

Falling Stars: 10 of the Most Famous Endangered Species

King Cobra snake in Malaysia. (reptile)

9 of the World’s Deadliest Snakes

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Jewish festivals Passover Hanukkah Rosh Hashana Sabbath Yom Kippur Purim Lag BaOmer Sukkot yahrzeit Tisha be-Av