Over time, the science of medicine has got better. Now few of us suffer much from infectious diseases like malaria or typhoid, and many of us live longer lives. But with age come new kinds of illness like Alzheimer's. Completely new kinds of medicines are needed to treat such illnesses.
If someone you know gets hurt and needs a lot of blood, you have to find a blood donor who has the same blood group. Did you wonder why this is so necessary? Why not anyone's blood? The answer lies in the chemistry of blood.
You'll have heard the fairy tale of Goldilocks - the girl who ate the Little Bear's Soup because it was neither too hot nor too cold. Well, life needs a planet just like that - neither too hot, nor too cold.
Today, most of our vehicles and electric power plants run on fuels that come from petroleum. The supply of these fuels will end a few decades from now. So what would power our cars and homes? The answer may be lithium.
We live in a world where petroleum and coal are getting rarer and more expensive. We also know they contribute to global warming. Experts are now looking towards other sources of fuel like shale gas. Let's try and understand more.
In the Second World War, soldiers injured on the battlefield often died of very low blood pressure before they could reach hospital. But there was a dramatic change when the Korean War happened. There was a miracle life saver around - dextran.
Heard of praseodymium and dysprosium? They sound like tongue twisters, don't they? They're a part of our daily lives - right inside our gaming consoles, mobile phones and digital cameras! So let's see how they affect us.