PIONEERING SCIENTIST The new book The Last Volcano chronicles the life of volcanologist Thomas Jaggar. Jaggar, second from left, is shown here measuring lava at Hawaii’s Kilauea volcano in 1917.
U.S. Geological Survey/Wikimedia Commons
MURKY RELATIONS Once thought of as cavemen, Neandertals may have built structures, researchers discovered 50 years ago. The finding led to speculation that Neandertals were direct ancestors of modern humans, a conclusion that is still hotly debated.
Charles Robert Knight
Regular salmon may soon be joined in grocery cases by genetically engineered fish (shown). The FDA has approved genetically modified salmon for human consumption.