Many preschool children spend too much time indoors huddled around screens. Despite the fact that time in nature increases opportunities for play and exercise, boosting children’s health and development and reducing hyperactivity — the bane of our short-attention span era — most American preschoolers don’t get enough time outdoors, according to a new national report from the National Institute for Early Education Research (NIEER). “Outdoor nature-based learning is vital for young children’s health, development, and education .. Increased screen time and reduced exposure to nature are linked to serious health problems, such as obesity, diabetes, hyperactivity, stress, asthma, and allergies.”