This Week in Science: Bizarre Birds, Cosmic Endings, and More

This week in science covers a range of topics including a study linking heart attack risks to four factors, the 2025 Nobel Prize winners, new insights into sleep and health, the discovery of a hybrid bird likely influenced by climate change, toenails revealing exposure to lung cancer hazards, and a model predicting the universe's eventual contraction and reverse Big Bang. The articles highlight major scientific breakthroughs and intriguing discoveries across biology, physics, and environmental science.