Where is the hottest place on Earth?

The hottest temperature ever recorded was at El Azizia in the Libyan Desert, where the temperature on Sept. 13, 1922 reached a scorching 136°F / 57.8°C. That's more than half way towards the temperature water boils at, but just a fraction of the temperature inside the Earth's core, which is thought to be at least several thousand degrees Celsius.

How do turtles navigate back to the beach they were born on to lay their eggs?

No one is quite sure how sea turtles manage to find their way across thousands of miles of open ocean to return to the beach where they were born. Like other long-distance migratory animals, it is thought that they are able to sense the Earth's magnetic fields and use this to determine their location. In other words, they use a kind of 'magnetic map'. They may also use underwater geographical features as navigational aids but again no-one really knows. Who says humans are the bright ones?

Where are the remaining populations of tigers?

Three of the eight sub-species of tiger are already extinct. Of the remaining species, the Bengal tiger is the most numerous, but there may only be as few as 1,300 left of this species, confined to pockets of forest in central India. FACT - Sadly, there are now more tigers in captivity around the world than there are in the wild, and all of the surviving species are critically endangered.

What are the Northern Lights?

The Northern Lights (aurora borealis to give them their Latin name) are a natural phenomenon that occurs in the Earth's atmosphere at the polar regions. (In the southern hemisphere they are known as aurora australis.) The lights appear as shimmering bands of colour in the night sky - usually green, yellow and pink - and are caused by charged particles from the sun colliding with the Earth's atmosphere.