References

Discover interesting facts about octopuses, an intelligent group of cephalopods with three hearts, eight arms and a reputation for causing mischief in oceans around the world.

Discover interesting facts about how big earthquakes can get, why earthquakes happen, and why they're so hard to predict.

Discover interesting facts about orcas, the deadly and beautiful predators that lurk in every ocean.

Discover interesting facts about where sharks live, how big they can get, and how likely it is to get bitten by one.

Buying guide From Under Armour Infinity High to Lululemon Enlite, these are the sports bras we recommend.

The deadliest cancers aren't necessarily the ones that kill the most people overall; they're the ones with the lowest survival rates.

REFERENCE Does yoga help you lose weight? We look at whether yoga can help you shed pounds.

Fact file Deforestation can include clearing the land for farming or livestock, or using the timber for fuel, construction or manufacturing.

It's the start of your spring marathon training, and here is everything you need, from the best running shoes to a home treadmill

BUYING GUIDE Unleash the music — these top wireless and compact options will help you step up your workouts.