Your houseplant salutes the sun each morning. At night, it returns to center. You probably don't think much of it. But what about all the signs of plant intelligence that have been observed? Under poor soil conditions, the pea seems to be able to assess risk. The sensitive plant can make memories and learn. And plants can communicate with one another and with caterpillars. Now, a study published recently in Annals of Botany has shown that plants can be frozen in place with a range of anesthetics, including the types that are used when you undergo surgery. Insights gleaned from the study may help doctors better understand the variety of anesthetics used in surgeries. But the research also highlights that plants are ... perhaps less different from animals than is often assumed. "Plants are not just robotic, stimulus-response devices," said [study co-author] Frantisek Baluska, a plant cell biologist. Plants ... take in information from their environment and produce their own anesthetics like menthol, ethanol and cocaine, similar to how humans release chemicals that dull pain during trauma. Our anesthetics work on plants too, the study confirmed, although what exactly they're working on is unclear. The electrical activity that moves across neurons is thought by some scientists to contribute to human consciousness. If electrical activity is being disrupted by anesthetic in plants, too, causing them to "lose consciousness," does that mean, in some way, that they are conscious?