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https://www.youtube.com/embed/N3ZrbKYmjQ0 what if i said that your drinking water contains  an element that's used in batteries and that   it could also be affecting your mood sometimes  referred to as the magic ion this element's name   is lithium and a recent review of decades of  research has found that trace amounts of lithium   found in the tap could be stabilizing your mood  and may even have the potential to reduce the risk   of suicide of all the elements lithium is one  of the lightest this soft silvery white metal   occurs naturally in soil rocks and many foods it's  also highly reactive particularly with water and   varying degrees of lithium can be found in  surface water groundwater and seawater around   the world and not only is it valued for boosting  the energy density of our batteries over the past   few decades lithium has gained recognition in  the medical community for its powerful…

https://www.youtube.com/embed/HRwey6cwGHo Hi. It’s Mr. Andersen and this is AP Physics essentials 136. It is on half-life and radioactive decay. To model that my daughter and I started rolling some dice. We have 32 dice in the cup. And what she would do is she would roll the dice and then she would pull all of a certain number out. So in this first simulation she is going to pull all of the 1s out.And so we put those to the side. That is generation one. And now generation two. And generation three. And generation four. Now when you get to the fourth generation, she has hit her first half life. What does that mean? Well if there were 32 to start, that is the amount of time it takes for half of those to decay. So that would be 16. So 16 have decayed right here. So she is going…