GETTY IMAGES ILLUSTRATION: KYLE SMART
In certain parts of the world, such as Canada’s Hudson Bay, gravity is slightly lower than elsewhere. This is because objects with more mass exert a greater gravitational force and Earth’s mass isn’t uniform, so gravity varies from place to place. You’d need some very accurate scales to notice though – gravity in Hudson Bay is about 4/1,000ths of a per cent less than Earth’s average.
When scientists discovered this anomaly in the 1960s, they developed two theories to explain it. The first is that Earth’s crust is still rebounding from the last Ice Age.