A sweeping study for the first time tallies butterfly data from more than 76,000 surveys across the continental United States. The results: Butterflies -- all of them -- are disappearing. Until now, artificial gels have either managed to replicate high stiffness or natural skin's self-healing properties, but not both. Now, a team of researchers has developed a hydrogel with a unique structure that overcomes earlier limitations, opening the door to applications such as drug delivery, wound healing, soft robotics sensors and artificial skin. Researchers have enabled a man who is paralyzed to control a robotic arm through a device that relays signals from his brain to a computer. He was able to grasp, move and drop objects just by imagining himself performing the actions. Just a few days of eating a diet high in saturated fat could be enough to cause memory problems and related brain inflammation in older adults, a new study in rats suggests. Researchers have discovered genes linked to obesity in both Labradors and humans. They say the effects can be over-ridden with a strict diet and exercise regime. Tropical rainforests play a vital role in global climate regulation and biodiversity conservation. However, a major new study reveals that forests across the Americas are not adapting quickly enough to keep pace with climate change, raising concerns about their long-term resilience. A study has demonstrated how neurons in the human brain generate memories and establish narratives. Contrary to previous beliefs, individual neurons represent the concepts we learn, regardless of the context in which we encounter them. This allows humans, unlike other animals, to establish higher and more abstract relationships, which lays the foundation of human intelligence. Researchers have discovered the world's oldest known meteorite impact crater, which could significantly redefine our understanding of the origins of life and how our planet was shaped. The team found evidence of a major...