Aryabhata's contribution to the study astronomy was extraordinary due to the fact he didn't have any modern equipment or instruments to do so. Therefore every discovery he had that solved various mysteries of the solar system was done with his hard work and dedication!
Answer:
In May 1942, he was arrested for failing to comply with the order for Japanese Americans to report to internment camps.
The last country to abolish slavery (in the Western world) was Brazil. It abolished slavery in 1888, by the time that almost 4 million slaves were transported from Africa to Brazil.
In the whole world, Mauritania was the last country to abolish slavery.