Wits University

Just as some researchers are trying to unlock the secrets of sleep in humans, others are turning their attention to the animal world. Among those is a team at South Africa's Wits University, who have sought answers by using Fitbit-like activity trackers to gauge the sleep quality of wild elephants.

While the bite from a puff adder, one of Africa's deadliest snakes, can take down a rhino, the reptiles can only strike within about 5-10 cm in front of it. Researchers have discovered that the snake employs a sneaky tactic called "lingual luring" to get its prey inside that deadly sphere.