1653 Marguerite Bourgeoys landed at Quebec, intending to start a school in Montreal. However, she found there were not enough children of school age because of heavy infant mortality rates

That's sad.

1953 The world’s first four-level interchange structure was opened in Los Angeles, California. The massive concrete structure connected the freeways of Hollywood, Harbor, Santa Ana, and Arroyo Seco

I've been on each of the freeways and through that interchange "stack".