Two thousand years may sound like a lot, but not to Lake Tahoe. The 23-mile-long, 12-mile-wide Tahoe – a unique lake because of its depth, elevation and clear water – has existed for many millennia.

A colour-changing lake born from a meteor impact keeps baffling scientists, blending space science, ancient myths, and rare life forms, raising one lingering question about Earth’s hidden mysteries.

HILO >> The greenish-blue, 520-foot long lake that recently formed at the bottom of Halemaumau Crater on Kilauea volcano amounts to the largest body of water inside the crater for at least the past ...