miscellaneous

Splatter blood for blood spatter analysis

Splatter blood for blood spatter analysis First we will let you in on a little secret. When you or your brother or sister do something wrong, your parents have to figure out who did it. To parents this is like a whodunit game and in fact, they have a secret name for it that they have sworn never to reveal to the kids (breaking this rule can result in loss of their official parenting card). It’s called the “which kid do we smack this time” game. And no, they don’t roll dice or draw straws to figure it out the winner. Parents have an eerie, almost superhero-like ability that allows them to scan human faces to determine the guilty party. It worked so well that a…
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Chemistry

Strange acting goop

Making Oobleck, the strange goop with amazing properties Ever had a hot, steaming cup of Oobleckh? Geez, I hope not. The stuff is nasty! But it does exhibit some interesting Put one and one half (1 1/2) cup of cornstarch into the bowl. Add one cup of water. Mix well. Slowly dip your finger into the gooey mixture. Feels liquidy? Grab some in your hand and pour it back into the bowl. Now, try slapping it hard with your hand or a heavy spoon. What happens? Why? The molecules in ooblekh (sometimes spelled oobleck) are very large compared to, for instance, molecules of water. When slapped quickly, they tangle themselves up preventing any splattering. In this way the mixture behaves more like a solid.  When…
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