From Nuclear Clocks to Ocean Shifts: Science Tracks Time, Life, and Planetary Change

Biology & Medicine

• Researchers have demonstrated the first functioning nuclear clock, an advancement that could lead to more robust timekeeping devices and new ways to search for dark matter and physics beyond the Standard Model [3]. For decades, physicists sought a clock using an atom's nucleus rather than its orbiting electrons [3]. This breakthrough is significant because it represents a major step toward building highly precise timekeeping tools and advancing fundamental physics research [3]. ^[3]
• Researchers are developing a less invasive method for assisted reproduction by making sperm magnetic, aiming to guide them directly into the fallopian tubes where they can fertilize an egg under natural conditions [57]. The technique involves incubating sperm with tiny iron oxide and polystyrene magnetic beads—about 30 per sperm head—which allows the sperm to be directed using weak external magnetic fields [57]. Initial tests showed that these magnetic cattle sperm formed healthy embryos at a rate comparable to non-magnetic sperm, and the beads did not affect early embryo development [57]. This approach could potentially allow for assisted reproduction *in vivo*, reducing the need for invasive procedures like hormone injections, egg retrievals, and embryo transfers associated with traditional IVF cycles [57]. ^[57]
• New research suggests that autism may comprise at least two distinct biological subtypes based on contrasting patterns of brain activity: hypoconnectivity (weak links) and hyperconnectivity (strong connections). The study found that among 940 autistic people, 24 per cent exhibited hypoconnectivity, while 17 per cent showed hyperconnectivity. These opposing signatures were linked to different biological mechanisms; for instance, in mice with hypoconnectivity, affected genes interacted with proteins involved with synapses, whereas those with hyperconnectivity involved proteins related to gene regulation and the immune system sources [24]. ^[24]