How many dimensions are there?

According to String Theorists, there are at least 10 dimensions. But there could be as many as 26.

Dark flow leads researchers to exotic conclusion

Two years ago, researchers reported the strange movement of hundreds of galaxy clusters moving in the same direction at about 3.6 million kilometers per hour. Current spatial movement models can’t explain this in any way, so at the time, they launched a strange hypothesis: clusters are being tugged by the gravity of something outside our universe. Just take a minute