LAKE BAIKAL, Russia — The ice rumbled and then shook underfoot. No one had warned Véronique Messina about that. Ms. Messina, a French speech therapist working in Cambodia, came to Lake Baikal ...

Some places on Earth hold stories older than humanity itself. One such place is Lake Baikal in Siberia. This enormous lake has existed for 25 million years, making it the oldest freshwater lake on ...