Mumbai train bombings: Two hundred nine people are killed in a series of bomb attacks in Mumbai, India.
The social media site Twitter is founded.
NASA reveals photographs taken by Mars Global Surveyor suggesting the presence of liquid water on Mars.
WikiLeaks is launched.
The world’s longest running music show Top of the Pops is broadcast for the last time on BBC Two. The show had aired for 42 years.
Twitter, later one of the largest social media platforms in the world, is launched.
A Palestinian suicide bomber detonates an explosive device in a Tel Aviv restaurant, killing 11 people and injuring 70.
The Mars Reconnaissance Orbiter arrives at Mars.
Madrid–Barajas Airport is bombed.
Al Jazeera English launches worldwide.