Example:
Dr. Roosevelt was carefully examining the Brontosaurus bones, occasionally jotting down in his notebook what bones might be missing from the primordial skeleton and what it might have looked like, when his assistant came running into his office.
"Doctor!" he shouted holding up an evening newspaper. "They have shot president Bryan"
Answer: Theodore Roosevelt goes into a carrier in the natural sciences, in TTL William Jennings Bryan is elected the president of the US in the beginning of the 20th century.