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While hurricane Debby makes landfall in Florida, let’s explore a special hurricane feature: Hurricanes don’t cross the equator because they’re spinning. And that spin is due to what’s called the Coriolis effect. If we look at the Earth from space, we’d see a Hurricane like a ball that’s constantly spinning counterclockwise. And because the Earth has a longer distance to cover at the equator in one day than at the poles, it’s spinning faster at the equator. Tropical storms form above warm ocean water near the equator. Warm air currents rise, and if conditions are right, even more air gets drawn in. That air begins to swirl around the low-pressure eye of the storm. Due to the Coriolis effect, the Northern Hemisphere, the circulating air is deflected from a straight to a rightward path. If it gathers enough force, it becomes a hurricane. In the Southern Hemisphere, the circulating air is deflected toward the left – again due to the Coriolis effect. So, depending on whether they’re north or south of the equator, these massive, swirling storms are spinning in opposite directions. If a hurricane were to approach the equator, it would eventually stop spinning and stall. And to cross the equator and continue onward, it would have to start spinning again –but now in the opposite direction. That’s possible in theory, but in reality it’s very unlikely. No hurricane or cyclone has ever been known to cross the equator. In 2001, a newborn typhoon formed just 150 kilometers north of equator, which is closer than had ever been observed before. But recent decades, tropical cyclones appear to be forming further and further away from the equator towards the Earth’s poles. Author: Katja Sterzik #dwscience #STEMTok #learningisfun #hurricane #debby #hurricaneflorida #hurricanedebby #weathertok #hurricaneseason #tropicalstorm #2024hurricaneseason #usa #floridaweather
What is narratology – and why does it matter? Conor and Gabe examine Peter Thiel’s controversial worldview in the context of a field of science called ‘narratology’ – or the crafting of a narrative that will resonate with human beings. Science Unscripted is a podcast from Deutsche Welle, Germany’s international broadcaster. Check the link in bio to listen to more Science Unscripted episodes. #dwscience #scienceunscripted #podcast
What happens during ovulation when your ovaries release an egg? It’s totally unhinged! During the fertile phase of a woman’s menstrual cycle around 15 to 30 eggs begin to mature in fluid-filled follicles, with only the largest follicle reaching ovulation. The follicle ruptures, releasing an egg into the fallopian tube, where fertilization may occur within 24 hours. A complex hormonal interplay regulates ovulation, though the mechanics are still largely unknown due to the challenges of studying such processes within the ovaries. A recent study successfully captured the three phases of ovulation in real-time under high-resolution microscopy. The first phase, follicle expansion, is driven by hyaluronic acid, causing fluid intake and follicle growth. In the second phase, muscle cells in the follicle’s outer layer contract. Finally, in the third phase, the follicle ruptures, releasing the egg. These findings, according to the study’s authors, confirm ovulation as an independent process; while an external signal acts as a trigger, the sequence of steps then unfolds independently within the follicle. The team’s new methods could enhance understanding of ovulation and contribute to human fertility research. Author: Mira Fricke Source/Study: Thomas, C.; Marx, T.L.; Penir, S.M.; & Schuh, M.: Ex vivo imaging reveals the spatiotemporal control of ovulation. Nature Cell Biology #STEMTok #ScienceTok #science #LearnOnTikTok #dwscience #dwhealth #fertility #TTC #biology #incrediblescience #ovulating
Itchy skin and rashes during extreme hot weather? In this video we explore why skin infections are common during heat waves, and what you can do about it without spending much. South Asia has been among the first regions to face the severe effects of climate change, with recurring extreme heat waves. Despite this, there is limited academic research on how heat impacts women’s health. The Ladies Survival Guide is a video series that brings questions from those affected by heat directly to a top environmental public health expert. Author: Sushmitha Ramakrishnan, Kate Martyr #DW_LSG #dwasia #dwscience #dwhealth #globalwarming #skincare
The rare nova explosion 2024 will be visible in our night sky soon! It’s not often that a dark spot in space lights up, but that is exactly what professional and amateur astronomers expect to happen in September 2024 — a once-in-a-lifetime nova explosion 3,000 lightyears from Earth will appear in ournight sky. We’ll be able to see it with our naked eyes. Astronomers are waiting for the fiery explosion of T Coronae Borealis, also dubbed the "Blaze Star" and known to astronomers as "T CrB". T CrB is actually asystem made up of two stars — a white dwarf and a red giant. The white dwarf is a dead star only about the size of Earth, but with the same mass as our Sun. Its neighbour the red giant is in its final years of existence and is slowly being stripped of hydrogen by the gravitational pull of the denser white dwarf. The explosion doesn't completely destroy either of the stars, so the nova event happens regularly over and over at around 80-year intervals – a pattern that could carry on for hundreds of thousands of years. This is different from a supernova, which can often kill a star. Author: Sushmitha Ramakrishnan #nova2024 #STEMTok #novaexplosion #supernova #nasa #LearnOnTikTok #space #dwscience #coronaeborealis
ADHD affects about 5% of people worldwide, but diagnosing it is tricky. Attention and impulse control are often affected, but symptoms vary a lot and often overlap with other conditions. Plus, diagnostic criteria keep evolving, and there’s still no single, definitive test for the condition. Now, scientists have trained an AI to spot ADHD in kids with around 96% accuracy, just by analyzing the back of their eyes — their retinas. The study, published in npj Digital Medicine, looked at 1,108 retinal photographs from 646 participants under 19. Half had ADHD, half were neurotypical. The AI spotted a major clue: kids with ADHD had denser blood vessels in their retinas. So, the retina might reflect some of the brain changes linked to ADHD, which could serve as a marker for the condition. It’s early research, but it could lead to new and easier ways to screen for ADHD in the future. Author: Esteban Pardo Study: Choi, H., Hong, J., Kang, H.G. et al. Retinal fundus imaging as biomarker for ADHD using machine learning for screening and visual attention stratification. npj Digit. Med. 8, 164 (2025). #neurodivergent #adhdtiktok #AI #STEMTok #sciencetok #LearnOnTikTok #dwscience #dwhealth
Cuttlefish are masters of disguise. They can change their body shape, color and texture using special cells — an ability that helps them sneak up on prey unnoticed. But how they use this shape-shifting skill for hunting is not fully understood. Now, scientists have recorded footage of 98 wild cuttlefish of the genus Sepia in shallow Indonesia reefs, identifying at least four distinct camouflage strategies. -The “leaf” display, where they stretch out their arms and wobble around, looking like a harmless drifting leaf. -The “passing stripe”, where they turn gray and make a downward moving dark stripe across their bodies, a form of motion camouflage. -The “branching coral” display, where they make their arms wavy and kinked, making the central ones look like branches and stretching out their lateral arms. This camouflage allows them to blend seamlessly into staghorn corals. -And the “pulse” display. Two pairs of arms point forward in a tight cone, while the others are angled upward. Their bodies turn gray, with dark pulses moving from the center to the tips of the raised arms. Scientists are unsure exactly how this trick works. Interestingly, cuttlefish don’t stick to just one technique. Most use two or three, and their approach varies by sex—with females favoring the leaf display. Author: Esteban Pardo #underwater #marine #ocean #biology #nature #Indonesia #Pacific #STEMTok #science #dwscience
Is your blood pressure fluctuating during heat waves like polio vaccinator Khadija’s? DW spoke to a leading women’s health expert to find out how to combat this. South Asia has been among the first regions to face the severe effects of climate change, with recurring extreme heat waves. Despite this, there is limited academic research on how heat impacts women’s health. The Ladies Survival Guide is a video series that brings questions from those affected by heat directly to a top environmental public health expert. Author: Sushmitha Ramakrishnan, Kate Martyr #STEMTok #LearnOnTikTok #dwscience #dwhealth #DW_LSG
If you're like Zakia, then your migraines get worse in hot weather, during the summer. This expert explains to Zakia the science behind her severe headaches and simple, cost-effective steps she can take to help her. #STEMTok #LearnOnTikTok #dwscience #dwhealth #DW_LSG