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Science

When Nerds are Geeks

They decide to calculate how quickly a vampire can drain a person's blood and submit it as a paper.

In this investigation we found that it takes 6.4 minutes to drain 0.75 litres of blood from the human body, this seems fairly reasonable considering it takes less than an hour to give 0.47 litres of blood when you donate from a vein [8]. However this blood is coming from your arm and the blood pressure is lower here whereas ours is coming from the external carotid artery. To take it one step further we could take into account more than 15% of the blood being lost from the body and also the pressure if the vampire was sucking as well as drinking. This would reduce the time taken and make the process more efficient.

They really only calculated how long it would take to drain 15% of a person's blood. After that, heart rate changes and their assumptions about flow rate would no longer hold. So, what? A good 20 minutes to really drain a person? Who has that kind of time? Vampires need to feed and run.


By min | March 22, 2016, 2:21 PM | Science | Comments (0)| Link



Stop Scaring the Babies!

Link

The experiment went like this: The babies, 270 15-months-old that included a mix of boys and girls, sat on their parents' laps across the table from a researcher called the "Experimenter."

The baby saw the Experimenter demonstrating how to play with a series of toys. In each trial, a second researcher, the "Emoter," reacted in either a neutral way ("That's entertaining.") or negative way by saying "That's aggravating!" in a stern voice when the Experimenter performed her action on the toy. The Emoter's reaction was the same for each toy.

Then the baby had a chance to play with the same toy.

The researchers measured how readily the babies imitated the Experimenter's actions. Babies who witnessed the angry outburst were less likely to play with the toy or to duplicate the adult's actions than babies who saw a neutral reaction from the Emoter.

...

Next, the Experimenter showed the baby how to play with a new toy. This time, however, the previously angry Emoter now appeared to be neutral.

"We wanted to see if babies would treat the anger they had seen before as a one-off event or whether they see it as being part of the person's character," Repacholi said.

When given the chance to play with the new toy, the babies who knew the Emoter's angry history avoided playing with the toy, compared with the babies who were in the neutral group.

"It's as if the baby doesn't trust that the Emoter is now calm," Repacholi said. "Once babies have detected that someone's prone to anger, it's hard to dismiss. They're taking a better-safe-than-sorry approach, where they're not going to take a risk even though the situation has apparently changed."

A second new study by Repacholi, Meltzoff and team suggests that babies are capable of coming up with appeasement gestures in situations involving anger-prone adults. The findings are published online and will appear in an upcoming issue of the journal Infancy.

Using a similar experimental setup, another group of babies -- 72 15-month-olds, with an even number of boys and girls -- first observed either the "angry" or "neutral" Emoter's reaction to toys used by the Experimenter.

Then, the twist: the Experimenter brought out new toys designed to be highly desirable to the infants, such as a toy with a small ball that lit up when rotated.

Sitting on their parents' laps, the babies got to play with the appealing toy briefly before the Emoter -- who had a neutral facial expression and wasn't showing any anger at this point -- asked for a turn.

What did the babies do? Those who had previously seen the Emoter be angry readily relinquished the toys. That is, 69 percent of babies in the "anger" group gave up the toys compared to 46 percent of babies in the "neutral" group.

"I was so surprised to see the infants give the toys away -- it was like they were appeasing or compromising with the adult," Repacholi said. "They didn't want to risk making the previously angry adult mad again. They didn't act this way with the other adult who had not shown anger."


By min | March 22, 2016, 2:11 PM | Science | Comments (0)| Link



Try Convincing My Parents

It was normal for my mother to go to Parent/Teacher Conferences to scold my teachers for not giving enough homework. My middle school English teacher was the one who finally told my mother to stop coming to these things when she asked my teacher what else i could do to improve my work. I was getting an A in the class. As my mother points out, you can always do better.

So, there's no way they're going to believe homework is not useful.

For elementary-aged children, research suggests that studying in class gets superior learning results, while extra schoolwork at home is just . . . extra work. Even in middle school, the relationship between homework and academic success is minimal at best. By the time kids reach high school, homework provides academic benefit, but only in moderation. More than two hours per night is the limit. After that amount, the benefits taper off. "The research is very clear," agrees Etta Kralovec, education professor at the University of Arizona. "There's no benefit at the elementary school level."

Before going further, let's dispel the myth that these research results are due to a handful of poorly constructed studies. In fact, it's the opposite. Cooper compiled 120 studies in 1989 and another 60 studies in 2006. This comprehensive analysis of multiple research studies found no evidence of academic benefit at the elementary level. It did, however, find a negative impact on children's attitudes toward school.

School already sucked because you had to get up at the ass crack of dawn for it. Then you spent hours being talked at. Homework was just the icing on that shit cake. Explain to me how forcing me to come up with a drawing that represents each vocabulary word for that week helps me improve my vocabulary. I still haven't figured that one out. Do you know how difficult it is to draw an adverb? Hours of my youth i will never get back.


By min | March 10, 2016, 10:48 AM | Science | Comments (2)| Link



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