A pair of monster black holes swirl in a cloud of gas in this artist’s concept of AT 2021hdr, a recurring outburst studied by NASA’s Neil Gehrels Swift Observatory and the Zwicky Transient ...
Swirl the mixture. What do you observe? When no more bubbles form, you can rinse out the bottle in the sink and get ready to try something new. A chemical reaction between the vinegar and the baking ...
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