Why do they have to use the jelly to get a reading ? What’s the purpose ? Also bonus if you tell me what it is.
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Something you could actually do with a 5 year old: Put a waterproof speaker by a pool then put your head underwater. The sound will be muffled and unclear. Now put your speaker underwater with you and it will sound crystal clear. The ultrasound gel is like putting the speaker underwater with you.
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