Try to answer the below questions (without looking at hints before). What is the water temperature at the bottom of an ocean or a deep lake? Assume surface air temperature at -20C. Which is colder -25C or -25F? Which is colder -55C or -55F? How many liters of water does the Earth have? Don’t need an exact number, just an order of magnitude. (Hint: Solve it as a Fermi problem. Estimate a complex, seemingly unanswerable quantity using logical assumptions, known values and basic math) We all know the Sun rises in the East and sets in the West. Which places on the Earth see the Sun rising from/setting in the North (or South) and when? On Dec 21, 2020, Saturn and Jupiter appeared in the sky to have a conjunction. They were in the same sign/rashi. Saturn takes 30 years to go around the Sun, while Jupiter takes 12 years. After how many years will they appear to be in the same sign again (not necessarily as close to have the conjunction we witnessed last December)? There are 2 possi...