how long after the big bang was the planck time, the time at which our current theories become completely unable to describe conditions any earlier in the universe?

Which of the following is not a physical property of mattera. melting pointb. heat of combustionc. viscosityd. boiling point

Farmer a has a deep well and needs a lot of water for her animals and crops. her neighbor, farmer b, has a shallower well. he needs less water than farmer a because his farm is smaller. in years of drought, sometimes farmer b can't get any water from his wells. what can farmer b do to decrease the likelihood of his well running dry?

Which of the following is probably the least necessary character trait needed to be a good clinical nurse?