At 5 a.m., six keepers file into the Houston Zoo's commissary kitchen and spend the next five hours chopping produce, portioning meat and weighing hay. By the time the rest of the zoo staff arrives, ...

ACIMS provides records of species and ecological communities (Elements) reported in Alberta, including which Elements are tracked and watched. ACIMS Element lists include scientific names, common ...

Two mathematicians have proved that a straightforward question—how hard is it to untie a knot?—has a complicated answer.

Senators are working through the weekend for the first time since the government shutdown began more than a month ago, hoping ...