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New ActivityThe latest activity to be updated on this site is called "Take Baht" (How many different ways can you make a given total with Thai coins?). So far this activity has been accessed 20544 times and 644 people have earned a Transum Trophy for completing it. 
Have you ever wondered how many different outfits you could make from your wardrobe, or how many ways a football manager could pick a starting eleven? That is exactly what you are doing here. This area of maths is called 'Combinatorics', and it is all about finding every possible way to arrange, choose, or combine things without losing your head in the process. Featured ActivityNine Digits Arrange the given digits one to nine to make three numbers such that two of them add up to the third. This is a great puzzle for practicing standard pen and paper methods of three digit number addition and subtraction. Recent News:This new qubit could be 100 times less error-prone in superfluid quantum computer breakthroughA proposed qubit made with superfluid helium could cut quantum computing error rates by around 100 times by shielding quantum information from common forms of electromagnetic noise. If experiments confirm the predictions, the technology could eventually work alongside today’s superconducting qubits or serve as a new kind of quantum memory. more... Caltech physicists finally measure a quantum energy ladder predicted 40 years agoResearchers have experimentally observed energy patterns that physicists have predicted for about 40 years. By arranging laser-trapped atoms into a quantum simulator, they recreated two different quantum tipping points and watched the atoms fall into the exact energy ratios predicted by theory. The technique could now be used to explore mysterious quantum systems where scientists do not already know the answer. more... Scientists find that “perfect” systems may be surprisingly fragileComplex systems may work better when their parts are not perfectly alike. Northwestern physicists found that carefully balanced variation, or “disorder,” can make networks such as power grids, ecosystems, neurons, and materials more stable. Even random differences sometimes improved stability compared with completely uniform systems. The discovery could help researchers design more resilient technologies and explain why natural systems are so rarely perfectly uniform. more... The shape behind the Einstein problem just revealed strange new physicsA mathematical shape famous for covering a surface without ever repeating has revealed an unexpected ability to twist light into unusual chiral patterns. The discovery could lead to new ways of controlling light, polarization, and advanced optical devices. more... Researchers find a Wordle strategy that wins 99% of the timeResearchers at Binghamton University have developed a mathematical strategy that can solve Wordle with a 99% success rate. Instead of simply guessing words packed with common letters or choosing the most likely answer, the method uses Shannon entropy, a measure from information theory, to identify guesses that reveal the most useful information. Each guess is designed to rapidly shrink the pool of possible answers, even when the guessed word itself seems unlikely to be correct. more... Scientists find a way to slash computer memory energy use by orders of magnitudeScientists have devised a new way to switch magnetic computer memory while using far less energy than today's leading technologies. By mathematically optimizing the pulses used to flip digital bits, the method could reduce energy consumption by several orders of magnitude. Simulations suggest it may bring future memory devices surprisingly close to the fundamental physical limit for processing information. The same idea could eventually work with electrical currents or ultrafast lasers. more... Harvard scientists turn knitting into shape-shifting smart fabricHarvard researchers have transformed ordinary knitting into a platform for creating fabrics that can snap between different shapes and perform useful functions. Using elastic yarns and industrial knitting techniques, the team engineered thick textiles that naturally curve and lock into multiple stable configurations, much like a light switch flipping between on and off. By adding conductive yarn, they turned these shape-shifting fabrics into soft electronic switches capable of controlling lights, counting steps, and responding to movement. more... |
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