In what year were helmets made mandatory for pro cyclists?

How did the constitution of 1917 try to resolve some of the problems that started the mexican revolution

Plz i will give use examples from the lessons and your own personal experiences to compose at least one well-developed paragraph on the following: define the term reserved powers, and give an example of a reserved power of government.

Which statement most accurately describes one way that either judeochristian principles or greco-roman principles have influenced modern democracy?