Ever notice how a 4-year-old stops every 10 feet on a walk? Turns out that’s one of the keys to fully experiencing the joy of being outside. In his new book, “Noticing: Intimate Encounters with the Natural World,” Children & Nature Network co-founder and writer Richard Louv makes the case for slowing down and reconnecting with all our senses, something kids do instinctively. “We’ve got 30, 50, some scientists say as many as 100 senses,” he says, arguing that excessive screen time narrows our sensory experiences down to sight and sound. Getting the full range back is a matter of practice — going outside and noticing everything, from the tiniest bugs to the texture of tree bark and the smell of flowers on the wind.