Do we really have more than three spatial dimensions?

In Einstein's relativity and the Standard Model, we only have three spatial dimensions. But there could be more, and many think there are.

Related Keywords

,Steve Detweiler ,Giorgio Gratta Stanford ,Juan Maldacena ,Rogilbert Wikimedia Commons ,A Chodoss Detweiler ,Bryan Brandenburg Wikimedia Commons ,Andrew Kuchling ,Ted Witten ,Alan Chodos ,Wikimedia Commons ,Large Hadron Collider ,Fermilab Today ,General Relativity ,