Between crested cactuses and the "four-arm flexing" cactus, Arizona's native flora can take some unusual shapes. Tucson even has the kissing cactus, which looks like a couple embracing. But the T-Rex ...

Nature has created some pretty weird cacti for our enjoyment. Add a bit of human intervention and the strangeness doubles. Grafted cacti are two species that are fused to make one plant. This is done ...

An optical illusion is a visual phenomenon where our eyes perceive something differently from reality, tricking the brain into misinterpreting what it sees. These illusions occur because the brain ...