How tennis helps your body; what does working long hours do to you?
2X MATCH-CHALLENGE: Double Your Impact for World Elephant Day!
Modern CT scan sheds light on the harem killing of Egypt’s last great emperor. Plus, Simone Biles and handling pressure
Photo of the Week: One of the century’s best images; traditions on rockets, riverbanks, and horseback
Fuel kids’ brains, download homework tool kits, and take a quiz about an ancient complaint letter
Our Top 10: Katie Ledecky’s mysterious health condition, what working long hours does to your body: the end of the colonoscopy?
Will a new blood test replace colonoscopies? Also, Magellan’s cursed journey
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