The effect that the Gero Crucifix had on Medieval German art would be how uniquely it portrays Christ in it such that it serves a monumental work of Christ compared to its earliest depictions before. It focused more on the image of the 'suffering Christ' on the cross.
The answer would be "People".
They have the ability to kill billions of people with one atom bomb instead of one person at a time with a flintlock pistol
The Boxer Rebellion. the Boxer Rebellion was an uprising in China between 1899 and 1901