Exploring the 2026 STEM Nobel Prizes

Upon his death in 1896, Swedish inventor Alfred Nobel bequeathed his fortune to establish the five Nobel Prizes. Awarded to honour “those who have conferred the greatest benefit on mankind” in physiology or medicine, chemistry, physics, literature, and peace (sorry, economists), they remain the most prestigious accolades in their fields. This year’s prizes live up to that standard, highlighting foundational work that led to major breakthroughs in neuroscience, organic chemistry, the origin of life, and the workings of the universe.

The Nobel Prize in Physiology or Medicine was awarded jointly to three men (the maximum allowed to share a prize): Karl Deisseroth, Peter Hegemann, and Georg Nagel. Hegemann and Nagel’s discovery of a protein called channelrhodopsin allowed Deisseroth to create nerve cells that switch on and off in response to light. The breakthroughs, made in the early 2000s, have been christened ‘optogenetics’ and have enabled researchers to deliberately activate or deactivate specific neurons, circuits, and pathways in subjects’ brains. Optogenetics has improved our understanding of how brains store memories, process feelings, signal rewards, as well as the neural circuits behind Parkinson’s. More recently, researchers have begun investigating its use in treatments. One promising case study used light-sensitive proteins to restore partial vision to a blind patient. Though already a neuroscience staple, new uses, including treatments for deafness and mental illness, are making the field ever more fruitful.

In chemistry, the award went to Henri Kagan and Kensō Soai for their foundational work in asymmetric synthesis. The prize concerns chiral molecules, which are not identical to their mirror images, like the ‘S’ and ‘Z’ pieces in Tetris. These two chiral versions are called left-handed and right-handed variants. Curiously, for many molecules, only one variant appears in living organisms, but for the longest time chemists could not figure out why. Without chiral help, reactions created equal amounts of both left- and right-handed molecules. In 1986, Kagan found that a partly one-handed catalyst could yield an even more one-handed product, and in 1995, Soai built on his work to discover the first autocatalytic reaction, which produces almost exclusively one variant. Many drugs behave differently depending on their chirality; the ability to manufacture just one version decreases production cost and waste. Reactions that can, over time, leave just one version of a molecule offer a plausible answer to one of the longest-standing questions about the origin of life, patching gaps in our knowledge of life’s beginnings.

Equally instrumental for discovering how life exists is a sound understanding of the universe.Francis Halzen won the prize in physics for his work directing the IceCube detector array, which included providing essential experimental data. IceCube was devised to detect neutrinos, particles that are elusive due to their low mass, neutral charge, and weak interactions with matter. Neutrinos have long interested astrophysicists because high-energy ones can arise from exotic scenarios like supernovae and dark matter annihilation, giving us more knowledge about the universe. Neutrinos could also hint at higher-dimensional theories of physics, though nothing has been found yet. Regardless of what we find, it will undoubtedly increase our understanding of the universe.

Decades from now, light-switched neurons, mirror-image molecules, and ghost particles in ice could still be foundational to research and exploration. The Nobel committee continues to remind us that curiosity is worthwhile and that nobody can predict which of today’s abstract questions, once answered, will change tomorrow’s world.

Image from Wikimedia Commons