How tattoos took over the world

The world’s most famous physicist explains why we need a new source of energy

Astronaut Andrew Thomas explains why wisdom should be taught in schools

• Space

How doctors create tech in the middle of nowhere

• Health

Our desire to live by the sea is destroying the nature we claim to love

Infographic: The amount of precious metal in smartphones

• Recycling

These strange “guardian angels” could be the future of medicine

• Disease

We asked the iconic presenter about the one idea that could save our planet

• Energy

Ron Garan hopes his 'space balloon' will change our perspective of our planet

• Space