Topics from December 2019 How do it rainmakers make it rain? Posted by Keshav Jain on Friday, December 27. 2019 How acidity is measured? Posted by Keshav Jain on Wednesday, December 25. 2019 When was the element roentgenium discovered? Posted by Keshav Jain on Thursday, December 19. 2019 Who is known for liquefaction of oxygen? Posted by Keshav Jain on Monday, December 16. 2019