Catch up on stories from the past week (and beyond) at the Slashdot story archive

 



Forgot your password?
typodupeerror

Comment Re:The talented ones can (Score 1) 250

Thus 5x3 becomes 5x5x5 or 3x3x3x3x3 instead of "STFU and memorize your times tables."

I'm fine with the repeated addition. My objection is the OR in your statement. Apparently not. The question was 5x3 and the kid wrote 5+5+5=15 and got marked wrong with no explanation because the teacher wanted 3+3+3+3+3=15. So I guess that you would have had a 50% chance of being marked wrong on a 2nd grade arithmatic worksheet as well, as absurd as that is. Correct answer notwithstanding.

BTW, that's not at all new. We covered multiplication that way in the 3rd grade back in 1975. Memorizing the table was just to make it quicker. I quickly "discovered" the commutative property while looking at the multiplication table and cut my memorization load in half. The part that confused the father was why is 5x3 = 5+5+5=15 "wrong".

As for 37+55, we decomposed that in the '70s as well, but I soon decided the easier decomposition was 37+55= 87+5 = 90+2=92. So I would say that meme was just someone wanting to complain. Of course the "old way" ends up in 30+50+10+2 anyway.

Shut up and memorize was not in practice during the education of the parents of today's students.

Comment Re: Other Non-Evidence-Based claims (Score 1) 302

1) "give me liberty or give me death" was always a minority position.
2) Things that work well when people live in rural areas with slow communication don't necessarily work well when people live in dense clusters (i.e. cities) and conversely.
3) It is always the job of the individual to assign weights to his Bayesian priors. The state may control the costs of your actions, but should not be allowed to control your beliefs.

I hope I've covered what you were asking, but it was a bit unclear.

Comment Re:The talented ones can (Score 1) 250

It was my example. It came from a photograph of the worksheet posted to Reddit by the child's father, who was wondering why the answer was 'wrong'.

Surely you don't expect the 2nd graders to start on Clifford algebras any time soon. They need to learn to walk before they run. Note that by the time you're multiplying vectors and matrices the process involved is sufficiently different from multiplying real numbers that not being commutative is not going to be an issue. I recall my high school math teacher demonstrating non-commutative multiplication. I was not confused in spite of having figured out the commutative nature of simple multiplication in elementary school.

Comment Re: Case in point (Score 1) 209

The speech to text can be nice (even if my phone keeps writing "free cat" when I say FreeCAD), but it clearly has significant limitations. I still can't even guess why my phone can respond to "flashlight on" but fails at "flashlight off".

It's also amazing that it's possible to draw a metal wire thinner than a human hair and even more amazing that it's possible to drill a neat hold through it's width without breaking it, but I really don't have much use for that day to day.

As for image generation, quick, how many fingers am I holding up on my right hand? (hint: not 6).

Comment Re:Imagine if the COVID vaccine cultists (Score 3, Insightful) 302

The thing is, it wasn't lying. First there wasn't much evidence for the myocarditis, then it was confounded evidence. Did the kid get myocarditis from the vaccine itself, or was it from the beginning of a COVID infection aborted because the immune system was already actively reacting to spike protein at the time.

Of course, over-arching all of that, COVID causes myocarditis too, and often worse so it wasn't all that clear if mild myocarditis from the vaccine would even matter. Try explaining that to people ready to eat horse paste and unsure why people are laughing at Trump's suggestion to inject bleach.

Then there's a question of how much of the distortion came from scientists and how much from journalists (mis-)quoting them?

Now that the data is in, we can see that there is some possibility of mild myocarditis from the vaccine.

The thing about science is that as more data comes in, theories change and so actions suggested by those theories also change. In emergent situations such as the COVID pandemic, data and change can come fast.

Perhaps a sports analogy. After the first baseball game of the year, plenty of batters have an average of 1.000 for the year. Plenty have .000 for the year. That will change a LOT in the next day. By the end of the season, batting averages don't move that much in a single game.

Slashdot Top Deals

Life. Don't talk to me about life. - Marvin the Paranoid Anroid

Working...