Theories.

So's gravity, evolution and relativity. You saying there's no truth in these either?

wtf? People expect to be hit by airplanes these days?

Of course. Since 1945 when a plane accidentally hit the Empire State Building (which didn't fall down, despite being built with 50 year old technology compared to WTC) because of poor weather, all buildings over 54 stories in the USA are designed to withstand earthquakes, high winds, and planes. Most in the rest of the world probably are too.