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Why Can't Humans Drink Seawater?

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This video talks about how osmosis causes changes in water levels inside of cells and helps us better understand the reason why humans can't drink salt water.   The Rime of the Ancient Mariner - Samuel Taylor Coleridge "Water, water, everywhere, And all the boards did shrink; Water, water, everywhere, Nor any drop to drink." Osmosis is the movement of water into or out of cells.  Salt water actually causes cells to lose water.  So if you were to drink too much salt water, you could actually die from dehydration. Read more about this from NOAA .
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How do we know the universe is getting bigger?

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To understand the evidence that the universe is getting larger, we need to understand the Doppler effect.  This is the reason why a siren from a police car or fire truck has a higher pitch as it is approaching and a lower pitch when it is traveling away from us. The two images below are really useful in trying to better understand the Doppler effect. The first image has a stationary red dot which is giving off waves, which is shown by the concentric blue circles.  The wavelengths of the waves being given off are represented by the distance between the concentric blue circles.  The waves would appear the same to four observers each located at the corners of the square area.  The second image shows waves being produced by a moving object.  In this case, the waves would appear to be different to observers on the right or left side of the square area.  Observers on the left side would observe waves that are stretched out because the object giving off ...
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NGSS HS-LS2-5 Photosynthesis

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One of the really important HS-LS2-5 performance expectations is that students know the inputs and outputs of photosynthesis.  The video below shows a lab I've used for years with my biology students to teach this concept. The word equation for photosynthesis is summarized below. carbon dioxide  +  water  +  light  ->  glucose (sugar)  +  oxygen Students test plants (anarcharis or elodea) in three different types of water. 1. tap water = medium CO2 2. tap water boiled one day before the lab = low CO2 3. tap water with added baking soda = high CO2 The lab also provides an opportunity to introduce (or review) the concept of a limiting reactant since the level of carbon dioxide determines how much oxygen the plants will make as they carry out the light reaction of photosynthesis.
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