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Herbicides like Roundup are products that inhibit plant and weed growth in a very specific way. Explore the biochemistry behind glyphosphate-based herbicides in this episode of HowStuffWorks.com.

You Asked:How do you crimp aluminum rain gutters to fit inside the elbows? --- Bob, Fogelsville, Pa.Marshall Brain Answers:There are two kinds of If you have ever wondered about the details of how one of these machines makes the bends, watch The alte ...

You Asked:How does an unborn child receive food while in the womb? --- Capt, Raigarh, IndiaMarshall Brain Answers:A baby gets all of his food, as well as his oxygen and water, from its mother's bloodstream. The baby's waste products (like C02) are di ...

You Asked:How fast does blood flow throughout the human body? --- Matthew, Hudson, OhioMarshall Brain Answers:This video provides a nice summary of the flow of blood through the body:So the blood comes out of the How long does the round trip take? A ...

You Asked:How is mercury made, and where does it come from? --- Jon, Las Vegas, Nev.Marshall Brain answered:Mercury is usually produced from cinnabar rock, also known as mercury ore. The rock contains mercury sulfide, which gives it its red color. To ...

You Asked:What would happen if red ants crawled into your laptop? --- Ramya, Tirupati, IndiaMarshall Brain Answered:For some reason, some species of ants are attracted to electronic devices. Ants do a lot of damage to electrical equipment like air co ...

How does speed control work in an electric golf cart? --- Stephen, Pittsboro, N.C.A golf cart is a pretty simple device. It has a set of In the simplest possible speed controller, the accelerator pedal is just a big switch. When you press the acceler ...

You asked:How do car batteries work? --- Ike, Charlotte, N.C.Marshall Brain answered:A car battery is based on lead-acid battery technology. This technology has been around for decades, it is relatively inexpensive, it is reliable even in the harsh e ...

You Asked:Marshall Brain Answered:That has got to be frustrating.Usually if it is an operating system or driver problem, you will get a blue screen or the computer will reset and reboot. But when it just turns off for no reason... let me give you two ...

You Asked:Marshall Brain Answered:If you look at the ingredient label for just about any kind of cheese puff, the first ingredient is corn meal and the second ingredient is oil. All of the other ingredients are in the coating.The basic idea is to tak ...

You Asked:Marshall Brain Answered:There are some gases that turn into liquids simply by compressing them at room temperature. Examples include butane, propane, carbon dioxide, nitrous oxide and The problem with nitrogen (and other gases like it, incl ...

You Asked:Marshall Brain Answered:The human head contains the So go grab two 5 pound bags of sugar or flour and hold them with one hand. Or think about a 10 pound bowling ball. It is a lot of weight perched up there on your neck, especially if you ar ...

You Asked:Marshall Brain Answered:If you have a normal sheet of notebook paper and you try to fold it in half multiple times, you probably cannot get it to fold more than 6 times. Maybe 7 if you are really strong. That maximum limit is caused by two ...

You Asked:Marshall Brain Answered:Why can't you make a snorkel that is longer than a foot? The problem has to do with the strength of your diaphragm muscle and the pressure of the water in the swimming pool.If you look at the problem in reverse, you ...

You Asked:Marshall Brain Answered:How does the crossing signal know that the train is coming? There are lots of ways that the sensing of the train could be accomplished. You could have a weight sensor or a big push-button switch in the track. You cou ...

You asked:Marshall Brain Answered:If you are a cannon ball and you jump into a pool of mercury, it would look like this:That happens because mercury weighs about 13.5 grams per cubic centimeter. Water, for comparison, weighs 1 gram per cc. So a 1-lit ...

You asked:Marshall Brain Answered:So we can ask, How long does it take the shuttle to reach an altitude of 100 kilometers?The solid rocket boosters burn for about Let's ignore the acceleration (So it takes approximately 150 seconds for the shuttle to ...

You asked:Marshall Brain Answered:If you want to buy a small gas turbine engine, this page can be helpful: But if you want to pursue the DIY option, many people get started in gas turbine creation using an old A basic jet engine has three parts: a co ...

In many parts of the world, leeches are surprisingly common. You can find them in Amazon jungles, but you can also find them in the local lake. They can be found in swimming in water or crawling on land. For example, if you jump to the 40-second poin ...

You AskedMarshall AnsweredThe basic idea used to create a jigsaw puzzle in a factory is die cutting. You can see the die cutting process in this video:But if you want to make a jigsaw puzzle at home, you can use a jigsaw (also known as a scroll saw), ...