I don't think there is much need for philosophy in this day, because science is way more advanced than it was. But back in Ancient Greece, philosophers were akin to our modern day geniuses. Most people just accepted certain things, such as the Earth being the centre of the universe or the Earth being flat. But philosophers thought about stuff, then did experiments to determine if these claims were true. So technically, philosophers were the original scientists.

Also "cogito ergo sum" is a self fulfilling thing. It just roughly means that if you're thinking about if you exist or not, then you've answered your own question, as something is thinking if you exist or not. So there is SOMETHING there to process the thought.

This is getting way too many replies for something that's been admitted to be a troll topic :/