Mega Tsunami with 50-Foot Waves Swallowed Ancient Island

A mega tsunami taller than a 50-story skyscraper once engulfed an island off the west coast of Africa, researchers say. This finding suggests the giant landslides and killer waves that such tsunamis can trigger might pose a major hazard to people living on islands and coasts, scientists added. Tsunamis are monster waves that are often caused by earthquakes.