The University of Calgary offers a two-day course in igloo building.
Mailing an entire building has been illegal in the U.S. since 1916 when a man mailed a 40,000-ton brick house across Utah to avoid high freight rates.
The zoo in Tokyo closes for two months of the year so animals can have a holiday from visitors.
Methane gas can often be seen bubbling up from the bottom of ponds. It is produced by the decomposition of dead plants and animals in the mud.
The world’s smallest mammal is the bumblebee bat of Thailand, weighing less than a penny.