Phil Eggtree is once again forced to endure another boring day of school in Riddle School 2. It’s up to you to help him slip away using nothing but your wits. Naturally, it won’t be easy; teachers, ...

Beneath Earth s surface, nearly 3,000 kilometers down, lies a mysterious layer where seismic waves speed up inexplicably. For decades, scientists puzzled over this D' layer. Now, groundbreaking ...