Hundreds defy major warnings to attend huge St George's Day parade
England's patron saint was honoured with a 3.5-mile procession through the streets
Washington shooting suspect shared anti-Trump manifesto just minutes before attack
The 31-year-old teacher seemingly planned out the shooting, detailing both his intended victims and his reasoning for the attack
Humans could reach new galaxy over four light-years away in just two decades
Solar sail experiments have previously demonstrated that sunlight alone can generate sufficient thrust to propel specially designed spacecraft
