Your indoor jungle might be leafing you frazzled. Houseplants have long been celebrated for their wide-ranging health perks , from lifting mood and easing fatigue to boosting pain tolerance and even helping the body recover faster. But a new study from Stanford University suggests that too much greenery can backfire, turning what should be a calming oasis into a source of stress. The findings shine a new light on a practice that dates back millennia. Five thousand years ago, Ancient Egyptians