It records your progress helps you see what you have achieved .

Did the universe cool off or get hotter as it expanded after the 'big bang"?

Which of the following always exist between two objects having mass ● elastic force ● contact force ●gravitational force ●magnetic force

Apopulation of bolts has a mean thickness of 20 millimeters, with a population standard deviation of .01 millimeters. give, in millimeters, a minimum and a maximum thickness that includes 68% of the population of bolts.