All posts filed under: Science

Science

What kind of diet make you lives the longest? Meat or Vegetarian?

Our ability to live a long life is influenced by a combination of our genes and our environment. In studies that involve identical twins, scientists have estimated that no more than 30% of this influence comes from our genes, meaning that the largest group of factors that control how long a person lives is their environment. Of the many possible environmental factors, few have been as thoroughly studied or debated as our diet. Calorie restriction, for example, is one area that is being investigated. So far, studies seem to show that restricting calories can increase lifespan, at least in small creatures. But what works for mice doesn’t necessarily work for humans. What we eat – as opposed to how much we eat – is also a hot topic to study and meat consumption is often put under the microscope. A study that tracked almost 100,000 Americans for five years found that non-meat eaters were less likely to die – of any cause – during the study period than meat eaters. This effect was especially noticeable …

Does endurance exercise suppresses the immune system?

Does endurance exercise suppresses the immune system?

It is commonly believed that some forms of exercise, such as endurance events, suppress your immune system and leave you at risk of infections, like the common cold. However, our latest review of the evidence suggests that this is probably not true. In fact, exercise seems to boost the immune system. The idea that endurance exercise suppresses the immune system stems from research in the 1980s and 1990s. In these studies, competitors of endurance running events, such as the Los Angeles Marathon, were asked if they had symptoms of infections in the days and weeks after the race. Many did, leading to the idea that endurance exercise increases infection risk. An overlooked problem in many of these studies was that symptoms of “infections” were not confirmed in a lab, so it wasn’t known if they were genuine illness symptoms. More recent studies have shown that most symptoms reported after marathons are not real infections. Instead, the symptoms are caused by other factors, such as allergy. These earlier studies put the cause of the increased risk …

Timeline United States Immigration Policy

U1952 Chinese immigrants undergo an interrogation at Ellis Island. Bettmann/Corbi Quota System Upheld As the Cold War deepens, the U.S. government consolidates its immigration and naturalization laws into one comprehensive federal policy. The McCarran-Walter Act ends policies stemming from the late nineteenth century designed to exclude Asian immigrants. However, the bill upholds the ethnicity-based quota system for new immigrants that favored white Europeans, revising limitations to admit one-sixth of 1 percent of each group already in the United States. President Harry Truman vetoes the bill, citing discrimination against Asian immigrants and decrying the “absurdity, the cruelty of carrying over into this year of 1952 the isolationist limitations of our 1924 law.” Congress overrides him to pass it. 1954 Three undocumented Mexican immigrants held under arrest. Gamma-Keystone/Getty Images Eisenhower Launches ‘Operation Wetback’ The postwar period causes a swell of illegal immigration to the United States from Mexico, with an estimated three million undocumented Mexicans in the country working mostly in agricultural jobs at significantly lower wages than what American workers receive. Under growing public pressure to …

Is mathematics truly a language?

Is mathematics truly a language?

Mathematics is called the language of science. Italian astronomer and physicist Galileo Galilei is attributed with the quote, “Mathematics is the language in which God has written the universe.” Most likely this quote is a summary of his statement in Opere Il Saggiatore: [The universe] cannot be read until we have learnt the language and become familiar with the characters in which it is written. It is written in mathematical language, and the letters are triangles, circles and other geometrical figures, without which means it is humanly impossible to comprehend a single word. Yet, is mathematics truly a language, like English or Chinese? To answer the question, it helps to know what language is and how the vocabulary and grammar of mathematics is used to construct sentences. What Is a Language? There are multiple definitions of “language.” A language may be a system of words or codes used within a discipline. Language may refer to a system of communication using symbols or sounds. Linguist Noam Chomsky defines language as a set of sentences constructed using a …

Religion vs Science

Religion vs Science

As the West becomes more and more secular, and the discoveries of evolutionary biology and cosmology shrink the boundaries of faith, the claims that science and religion are compatible grow louder. If you’re a believer who doesn’t want to seem anti-science, what can you do? You must argue that your faith – or any faith – is perfectly compatible with science. And so one sees claim after claim from believers, religious scientists, prestigious science organisations and even atheists asserting not only that science and religion are compatible, but also that they can actually help each other. This claim is called “accommodationism.” But I argue that this is misguided: that science and religion are not only in conflict – even at “war” – but also represent incompatible ways of viewing the world. My argument runs like this. I’ll construe “science” as the set of tools we use to find truth about the universe, with the understanding that these truths are provisional rather than absolute. These tools include observing nature, framing and testing hypotheses, trying your hardest …

Ebola outbreak in the Democratic Republic of the Congo

Ebola outbreak in the Democratic Republic of the Congo

The Ebola outbreak in the Democratic Republic of the Congo (DRC) is quickly becoming an international concern. With 489 people diagnosed with the disease and 280 deaths, it is already the second largest Ebola outbreak in history (although still dwarfed by the 2014 West Africa outbreak). While the DRC has a good track record of responding to these outbreaks, the ongoing military conflict in the country is making the response much more difficult. Healthcare workers have been attacked, vaccination campaigns halted and, most recently, experts from the US Centers for Disease Control and Prevention were recalled from an outbreak zone due to security fears. This is all despite the DRC hosting the UN’s largest peacekeeping force, MONUSCO (Mission de l’Organisation des Nations unies pour la stabilisation en République démocratique du Congo). The United Nations Security Council (UNSC), the body responsible for maintaining international peace and security, acknowledged the situation in the DRC by issuing a resolution (resolution 2439) that calls for an end to the violence so that humanitarian groups can have better access to …

Universe Got Its Bounce Back

Universe Got Its Bounce Back

Humans have always entertained two basic theories about the origin of the universe. “In one of them, the universe emerges in a single instant of creation (as in the Jewish-Christian and the Brazilian Carajás cosmogonies),” the cosmologists Mario Novello and Santiago Perez-Bergliaffa noted in 2008. In the other, “the universe is eternal, consisting of an infinite series of cycles (as in the cosmogonies of the Babylonians and Egyptians).” The division in modern cosmology “somehow parallels that of the cosmogonic myths,” Novello and Perez-Bergliaffa wrote. In recent decades, it hasn’t seemed like much of a contest. The Big Bang theory, standard stuff of textbooks and television shows, enjoys strong support among today’s cosmologists. The rival eternal-universe picture had the edge a century ago, but it lost ground as astronomers observed that the cosmos is expanding and that it was small and simple about 14 billion years ago. In the most popular modern version of the theory, the Big Bang began with an episode called “cosmic inflation” — a burst of exponential expansion during which an infinitesimal …

A Short Guide to Hard Problems

How fundamentally difficult is a problem? That’s the basic task of computer scientists who hope to sort problems into what are called complexity classes. These are groups that contain all the computational problems that require less than some fixed amount of a computational resource — something like time or memory. Take a toy example featuring a large number such as 123,456,789,001. One might ask: Is this number prime, divisible only by 1 and itself? Computer scientists can solve this using fast algorithms — algorithms that don’t bog down as the number gets arbitrarily large. In our case, 123,456,789,001 is not a prime number. Then we might ask: What are its prime factors? Here no such fast algorithm exists — not unless you use a quantum computer. Therefore computer scientists believe that the two problems are in different complexity classes. Many different complexity classes exist, though in most cases researchers haven’t been able to prove one class is categorically distinct from the others. Proving those types of categorical distinctions is among the hardest and most important …

Genetic Engineering to Clash With Evolution

Genetic Engineering to Clash With Evolution

In a crowded auditorium at New York’s Cold Spring Harbor Laboratory in August, Philipp Messer, a population geneticist at Cornell University, took the stage to discuss a powerful and controversial new application for genetic engineering: gene drives. Gene drives can force a trait through a population, defying the usual rules of inheritance. A specific trait ordinarily has a 50-50 chance of being passed along to the next generation. A gene drive could push that rate to nearly 100 percent. The genetic dominance would then continue in all future generations. You want all the fruit flies in your lab to have light eyes? Engineer a drive for eye color, and soon enough, the fruit flies’ offspring will have light eyes, as will their offspring, and so on for all future generations. Gene drives may work in any species that reproduces sexually, and they have the potential to revolutionize disease control, agriculture, conservation and more. Scientists might be able to stop mosquitoes from spreading malaria, for example, or eradicate an invasive species. The technology represents the first …

Finding links between the Standard Model of particle physics and the octonions

Finding links between the Standard Model of particle physics and the octonions

In 2014, a graduate student at the University of Waterloo, Canada, named Cohl Furey rented a car and drove six hours south to Pennsylvania State University, eager to talk to a physics professor there named Murat Günaydin. Furey had figured out how to build on a finding of Günaydin’s from 40 years earlier — a largely forgotten result that supported a powerful suspicion about fundamental physics and its relationship to pure math. The suspicion, harbored by many physicists and mathematicians over the decades but rarely actively pursued, is that the peculiar panoply of forces and particles that comprise reality spring logically from the properties of eight-dimensional numbers called “octonions.” As numbers go, the familiar real numbers — those found on the number line, like 1, π and -83.777 — just get things started. Real numbers can be paired up in a particular way to form “complex numbers,” first studied in 16th-century Italy, that behave like coordinates on a 2-D plane. Adding, subtracting, multiplying and dividing is like translating and rotating positions around the plane. Complex …