Misc: what egyptian object is also known as 'the key to the nile'?

Questions

George Washington creates the Order of the Purple Heart.?

John Heathcoat, invented lace-making machinery, born.?

Battle of Boyac ; Bolivar defeats Spanish in Colombia.?

Mata Hari, dancer, courtesan, spy, born.?

Theophilus Van Kannel of Philadelphia receives a patent for his revolving door -- described as a storm door structure.?