These are the people who challenge, lead, and aspire for change. If you haven't heard of them yet, get ready to meet my top most powerful people in the world:

1. Angela Merkel: Chancellor of Germany.
A valuable leader, considering Germany is Europe's largest economy - nothing can happen without Merkel's approval.

2. Salman Khan: Tutor (not the actor!)
A pioneer in education. he began posting small maths lessons on the web, now he teaches everything from Economics to Science, making education accessible (and free) for all at Khanacademy.com

3. Barack Obama : President of USA: Probably one of the most powerful leaders in the world, bringing hope, and change. Yes we can - do you remember that speech?

4. Henrik Scharfe : Professor, M.A. Ph.D:  Throughout the years, technology has quickly advanced, and will continue advancing. Forget about R2-D2, here we're talking about a teleoperated android. In other words, a robot resembling a human being. Scharfe supervised the design process of his Geminoid-DK.

5. Donald Sadoway: Engineer
The environment, climate change, and renewable resources have become a hot topic. Sadoway is an energy engineer who is finding a way to make batteries using molten salt and liquid metal. Imagine how much energy will be saved?!

6. Virginia Rometty - Chief Executive of IBM 
A great example for ambitious women in the workplace, especially in business and technology. 

7. Portia Simpson Miller - Prime Minister
Not just any politician - marking change, peace and promoting civil rights, she is the first woman to be elected as the prime minister of Jamaica

Each of these people have taught me a liitle something about life. 
Who will be on your list?