Cycles of Change

Human biology depends on an internal clock using natural sunlight to decide when people should sleep. When the evening sky turns dark, the brain makes a chemical called melatonin. This powerful chemical makes muscles feel exhausted and tells the human body to rest. But when the summer sun stays [...]

Modern city roads rely on traffic lights to guide cars and protect walkers across busy street corners. In most towns, these signals still run on clock timers that follow fixed dials built decades ago. Such older controls cannot sense real vehicle lines or adjust to sudden jams on side roads. When a [...]