The only plane permitted to fly on Sept ... 11, 2001, four planes were hijacked and intentionally crashed – two at the World Trade Center, one at the Pentagon, and a fourth at a field in ...

A cargo plane which crashed in northern Greece was carrying 11 tonnes of weapons - including landmines - to Bangladesh, officials say. People living within two kilometres of the site where the ...

Shown here is an imperfect crystal with its "slip plane" labeled. The slip plane is an imaginary line that divides the whole crystal or part of the crystal into two areas. A typical metal crystal ...