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This article discusses the shelf life of canned food in a post-apocalyptic world. The author explains that the longevity of canned food depends on factors such as the type of can, the food inside, and the storage conditions. Canned low-acid foods can remain edible for up to five years, while high-acid foods should not be left in cans for longer than one-and-a-half years. The article also mentions that honey has an indefinite shelf life if properly sealed. Additionally, the author mentions other methods of extending the life of food, such as dehydrating, freeze-drying, and vacuum sealing. [Extracted from the article]

The article discusses the best strategy for saving energy while cycling on hilly roads. The author explains that it is more efficient to freewheel downhill and save energy for the next uphill climb, rather than pedalling fast to gain momentum. The article also mentions the importance of aerodynamic resistance and the benefits of using gravitational acceleration when going downhill. Additionally, the article briefly mentions the scarcity of fossilized dinosaur poop, known as coprolites, and its significance in understanding the diets and environments of dinosaurs. The author concludes by stating that poop and waste are recycled by decomposers in the ecosystem. [Extracted from the article]

This article discusses various scientific questions and phenomena. It explains that the cells in an astronaut's body still multiply at the same rate despite time changes caused by the speed of space travel. It also explores the concept of time dilation and the twin paradox, which is confirmed by experiments and has practical implications for GPS satellites. Additionally, the article addresses the question of what happens when a hammer hits a nail, explaining that the electrons in the hammer repel the electrons in the nail, causing the atoms in the nail to move. Finally, it discusses how marine reptiles breathe and mentions the Fitzroy river turtle, which can absorb oxygen through its cloaca. [Extracted from the article]

The article discusses the ongoing debate among philosophers, biologists, neuroscientists, and computer scientists about how to identify consciousness in artificial intelligence (AI). There is uncertainty about whether a machine with human-like artificial general intelligence would possess consciousness, as it may lack self-awareness, intentionality, autonomy, or desires. The article also highlights the tendency for humans to anthropomorphize machines and misattribute consciousness to them. Different perspectives are presented on how to test for AI consciousness, including defining the level of consciousness required, emulating states of animal consciousness, and determining the role of genetic imperative. The article concludes with speculation about the potential consequences of AI consciousness and the energy efficiency of running versus skipping. [Extracted from the article]

The article discusses how the speed of gravity is believed to be the same as the speed of light, as indicated by Albert Einstein's general theory of relativity. While gravity was once thought to be instantaneous in Newtonian physics, gravitational waves, which carry significant information, are measured using detectors like LIGO and Virgo. Through observations of binary pulsars and events like the collision of neutron stars detected by LIGO, scientists have found evidence suggesting that the speed of gravity is close to the speed of light. The article also touches on the relationship between the speed of light and the dimensions of space and time in general relativity, highlighting the challenges in reconciling quantum theory with the concept of quantum gravity. [Extracted from the article]

This article discusses the concept of maximum acceleration and its limits. It explores the idea that there may be a maximum acceleration if there is a fundamentally shortest length of time. Factors such as force, mass, and structural strength determine the upper limit of acceleration for different objects. The article also explains why photons of light appear to slow down or speed up when passing through different media with varying refractive indices. Additionally, the article examines the ability of animals to climb hills and suggests that dogs can climb with ease due to their physiology, while humans fall somewhere between dogs and horses in terms of climbing ability. [Extracted from the article]

This article explores the question of why flies can easily enter a house through an open door but struggle to find their way out. Various explanations are offered, including the idea that flies prefer the still air indoors, the concept of entropy and statistical mechanics, the possibility that the house is more attractive to flies than the outside world, and the hypothesis that flies are attracted to UV light. The article also discusses the human attraction to shiny objects, suggesting that it may have evolved from our ancestors' reliance on lithic materials for survival. [Extracted from the article]

Crows and other members of the corvid family, such as rooks, ravens, jays, and magpies, have individually distinct voices. This is because crows produce loud vocalizations of much lower pitch than most birds, making it easier for humans to recognize individual crows. Scientific studies have shown that adult corvids have a wide variation in their voices, and rooks have their own repertoire of calls that are distinct from those of other males. Individually distinctive voices are especially important for social species like corvids, where multiple individuals live together for extended periods. [Extracted from the article]

I have just seen two people exercising together. She was running while he cycled beside her. She was only moving herself, but he was moving the bike too. Who expended [...]

The article discusses the topic of animals making mistakes and learning from them. It highlights that all living beings, including animals, make mistakes as a part of life and natural selection. The examples provided include birds flying into windows, cats getting stuck in trees, and animals learning from their errors. The article emphasizes that animals, especially young ones, learn through trial and error. It also mentions that cognitive mistakes are harder to overcome than physical mistakes. The summary also briefly mentions another question discussed in the article about why leftovers from a hot meal often taste better when reheated. [Extracted from the article]

If the Earth were to stop rotating, it would not affect the force of gravity, as gravity is caused by mass and the Earth's mass would not change. However, for an observer on Earth, there would be a slight difference. When the Earth rotates, there is a centrifugal force pushing away from the Earth, which is largest at the equator and zero at the poles. If rotation stopped, a person at the equator would feel slightly heavier, while the reduction in weight would diminish closer to the poles. This is known as the Eötvös effect. However, if the Earth were to stop rotating instantly, the consequences would be catastrophic, including firestorms, tsunamis, and extreme weather changes. [Extracted from the article]

The article discusses the fate of sound energy and its conversion into heat. It explains that sound exists as vibrations in the air, which can be converted into heat. However, the amount of heat generated from sound is negligible in terms of global warming. The article also explores the philosophical question of whether a sound is only what is heard or includes all pressure waves. Additionally, it touches on the topic of how sound waves change as they go higher into the atmosphere. The article concludes by mentioning the landing difficulties faced by birds and the potential for the Voyager spacecraft to crash into a planet or star in the future. [Extracted from the article]

If the laser and tube were about 15 million km from the event horizon and the low-gravity observer were 200 million km away, the low-gravity observer would see it takes about 15 minutes for the laser to go around. High speed We know time slows down as gravity increases, so is the speed of light in high gravity different from its speed in low gravity? The low-gravity observer can calculate that the speed of light in that warped four-dimensional high-gravity space-time is the same as in their four-dimensional low-gravity space-time when correcting for that warping. [Extracted from the article]

Also, Venus's surface gravity is similar to that on Earth and to get back home, you would be going up the sun's "gravity gradient" (or on a long, roundabout gravitational slingshot journey). Would it be theoretically possible to build a large habitable dome on the surface of Venus, one of the most inhospitable places in the solar system? Anna Butcher, Brookton, Western Australia We know time slows down as gravity increases, so is the speed of light in high gravity different from its speed in low gravity?. [Extracted from the article]

The other three squares neighbouring the white dot must have white diagonals, and then the pairs of tiles remaining next to the black dots must have black diagonals. Note that a cyclist going at a moderate cycling speed (MET 7.5) will burn around twice as many calories as someone walking at a moderate walking speed (MET 3.5), but, of course, the cyclist is going much faster and further. The formula for these values is MET × weight (kg) × time (hours) = calories burned (kilocalories). [Extracted from the article]

David Marlin Equine exercise physiologist, Cambridge, UK Horses are herd animals. When a horse finds itself surrounded by other horses all intent on running in one direction, its simple instinct is to respond to the "danger" pursuing them and to strive not to be that final doomed straggler. "Wild horses are herd animals whose main defence against attack by predators is to run. [Extracted from the article]

Gravity emerges from mass, and you moved a minuscule bit of mass lower, making an infinitesimal dimple in Earth's gravity well larger at the expense of the tank's teeny gravity well. Spent force I fill a bucket with water from a tank by gravity, but what happens to the gravity? Alex Wilkins New Scientist reporter A force field - in gravity's case, a gravitational field - is something that extends throughout the universe and interacts with any particle that can interact with that field. [Extracted from the article]

@Grammar dammit, via Twitter Lots of people yawn without closing their eyes. Their eyes close when they yawn due to tiredness, but stay open during a stress-related yawn. Rolling dilemma Which is the best way to put a roll of toilet paper onto the holder: rolling towards you or away?. [Extracted from the article]

Views Editor's pick Are extremes of global population still possible? I'm a witness to knee ligament's power to heal 19 November, p 19 From Andrée Goodson, Norwich, Norfolk, UK That bad anterior cruciate ligament injuries can self-heal is no surprise to me. In such a situation, might black holes continue to grow and even to meld with the planets and black holes of neighbouring universes?. [Extracted from the article]

Several letters to the editor are presented in response to articles published in previous editions of the journal on topics including British biofuel incentives, reducing carbon dioxide emissions, and the interpretation of quantum theory.

The article presents several answers to the question related to impact of humidity, drinking of wine with bubbles and mosquito bites frequently induce a sharp sting in people.

The article presents questions and answers related to science including why human beings throw stones into bodies of water and why chicken eggs have one rounded end and one pointed end.