Problem: What was the city of Kolkata formerly called?
Answer: calcutta

Problem: Which writer's autobiography was published in 2010, 100 years after his death as instructed in his will?
Answer: mark twain

Problem: What was the name of the first British jet bomber built in 1949 by English Electric?
Answer: canberra

Problem: Scientists study the red shift to investigate which aspect of cosmology?
Answer:
expansion of universe