Key question in deadly Tahoe avalanche: Why did skiers leave shelter in blizzard conditions?

Among the other unknowns after the disaster is how far apart the four guides and 11 clients were as they skied, given that ...
BBC

2D and 3D shapes

Explore four-sided shapes looking at straight lines, curved lines and 2D shapes. What are 3D shapes? Learn about 3D shapes and their properties. What is tessellation? Find out how tessellation is when ...