have you ever cultivated a cactus?

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i bought a pot of cactus. it's so cute and tiny that it can make me happy when i see it. i usually put it beside my computer. because i heard it can absorb radiation. now, the winter have come. how can i protecct the tropical plant. i put it under the sun. but what about when the sun hinding in the clouds? it's so cold. furthermore,i felt stange when i worried about the plant. is there emotion between me and the plant?