QUESTION: answer this: what does ap class mean in high school??

ANS: Advanced Placement


QUESTION: answer this: what discovery set off a massive migration to california??

ANS: gold


QUESTION: answer this: to increase the depth of field what must you do to magnification??

ANS: decreasing magnification increases DOF


QUESTION: answer this: who discovered the planets orbit around the sun??

ANS:
Edmond Halley