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Hello, I'm Dr. Heidi, creator of Vocab Victor, and today I'd like to talk to you about your

vocabulary size, which is how many words you know in English. So, I want you to think about

two questions. One, how many words do I know now, and Two, how many words should I know?

What's a good size vocabulary to have? The answer to that question has to do with your

ability to function well in English and to understand a lot of the language that you

encounter. So, for example, if I want to read this book and I don't know any of the words,

obviously I can't read it. If I know ALL the words, I can read and enjoy it but I might

not learn anything new. And if I only know half the words, then as I read it, I'm going

to have to stop, and look up words in the dictionary, and then I'll lose my place, and

forget what I was reading... it can be very frustrating to try to read something if you

don't know a lot of the words. So what I want to find is what we call in

English a sweet spot, which is the right amount so that you can understand MOST

of what you are reading and continue to learn new words. And according to linguists who

have studied this, that sweet spot is at about a 5,000 word vocabulary.

It's not exact, some people will say more, some will say less, and it also depends on

what you're reading, so if you are reading something very technical or very scientific,

a 5,000 word vocabulary might not be enough. But, for the general types of things you see

every day - articles, books, stories, web sites - if you have a vocabulary size of about

5,000 words you will be able to understand about 90% of what you read, and that's enough

to read fluently while also learning new words. So, how do you get there? Well, the first

thing to know is, how many words do you know now? Next I'm going to show you how to find

the answer to that question.

This is the vocabulary test web site, testyourvocab.com.

I put the link in the description below. And it's a very simple type of vocabulary test

that will show you how many words you know. This type of test is called a checkbox test.

So, each one of these boxes is called a checkbox. It's very simple. You read each word ... like...

think about it to yourself. And if you know the meaning of the word, you check the checkbox.

So, think ... yes, I know what that word means, go ... I know what that word means, look ,,, I

know what that word means. And I really want you to pay attention when you take this test.

Read the words and think about what they mean. Like, withdraw ... okay, maybe you don't

know what that means, don't check the box ... mist ... don't check the box if you don't

know what it means. It's really important. Don't go through and just go, Click click

click, oh yeah I know that word, click click click." Because if you give this test bad

information, then the test will give you bad information. It's really important to be

honest. This is not for a grade. This is not for a test. This is not to impress anybody

with your vocabulary size. This is for your personal knowledge to understand your own

vocabulary size. After you finish this screen, you come to

the second screen. This is basically the same activity with some different words. And again,

go through each and every word ... never ... read it to yourself. Think about it to yourself.

If you know the meaning of the word, check the box. If you don't know the meaning of

the word, skip it. That's all you do. Go through each word. This is a very sophisticated

test and it will do a good job of testing your vocabulary if you answer the questions

honestly. You probably will not know all the words. This is on purpose. It's part of

the design of the test that some of the words will be too hard for you. So, don't worry

about that. When you're done, Continue. And then, this comes to the research survey

where it wants to know if you're a native speaker, how old you are, and so forth. I'm

not going to answer this because I didn't give accurate answers. I'm just testing

it to show you as a demo how to do the test. So then I will tap finish. So this is my estimated

size of 231 words. This is really small because I didn't give accurate answers, I was just

kind of rushing through the test to show you. When you do the test I think your vocabulary

size will be bigger. And when you finish, if you want to, I would love to know what

your vocabulary size is. Go ahead and enter it into the comments section below. I would

love to see the different results that people have. So that is the vocabulary size test.

It's pretty straightforward.

After you take the test, you will know your

vocabulary size. So maybe you know 1,200 words or 3,600 words. If you are a native English

speaker you can take the test and the number will be much higher. If your vocabulary is

higher than 5,000 words, that's great. I only have one word for you: Read. Read as

much as you can. Reading will help you continue to improve your vocabulary and strengthen

your language skills. If on the other hand your vocabulary size

is less than 5,000 words, I want you to set a goal for yourself to close that gap, that

space in between. So, why do I want you to set a goal? Well, for example, I recently

started running. I said, okay, I'm going to run, I need the exercise. So what if you

said to me, Dr. Heidi, what is your running goal, and I said, No goal, just running. I

would probably exercise and have some fun. But what if you said, what is your goal? And

I said, well, I want to run a 5K race and I want to finish it in 30 minutes and I want

to do it by next month. Now, I have a goal, and that means every day when I run I'm

going to try to run a little faster, and run a little farther, I'm going to practice

more often because I'm trying to achieve my goal. I could say to you, go learn more words.

And, you would learn! You're studying, you're working on it, you're a good student, you're

trying to improve your English. But if I say, try to get from your current level to 5,000

words, you've got a goal you can work on, and you can work on it for a couple of months

and then come back, take the test again and see how much progress you've made. It's

a lot of words, it is a lot of words. But you only know 1,200 words that might feel

like it's too much; that's okay, you can set a smaller goal, like by the end of this

semester I want to be at 2,000 words. Set a goal for yourself that you think can make.

Next video I will show you tips on how to improve your vocabulary, especially if you

are under 5,000 words. Again, if your vocabulary is over 5,000 words go read. It's the best

thing that you can do. But at any level, one way to improve your vocabulary is to play

Vocab Victor. Vocab Victor is an app that I made to help non-native speakers improve

their English language vocabulary. You can download it for free on the Apple Store or

Google Play. It's very colorful. It's got all different word learning games, and it

will adapt to your level, so it will give you harder words or easier words depending

on how you do. So, subscribe to this channel, and play Vocab Victor, come back next time

and I will help you become a vocabulary winner.

For more infomation >> How many words do I know? How many words should I know? - Duration: 9:50.

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How Many Children Can A Human Have In A Lifetime? - Duration: 3:22.

Narrator: Imagine having so many children,

you could run a factory.

That's what Moulay Ismail's family looked like.

He was a brutal emperor of the Moroccan Alaouite Dynasty

from 1672 to 1727,

and he was reported to have had at least

1,171 children.

But he wasn't the only one

who used his power to sleep with hundreds of women,

whether they were interested or not.

Other rulers like Augustus the Strong,

and Genghis Khan had hundreds of children,

and while these were some of the more ruthless rulers

of their time,

it raises a more fundamental scientific question.

Women can reproduce for about half their lifetime

and can only give birth about once every year or so,

so it makes sense that women can only have a fraction

as many children as men.

One study estimated

that women can have around 15 pregnancies

in a lifetime, and depending on how many babies

she gives birth to at a time,

a woman can probably have around 15 to 30 children max.

But the most prolific mother ever,

according to Guinness World Records,

was Mrs. Feodor Vassilyev in 19th-century Russia.

She is said to have given birth to 69 children

over 27 pregnancies.

That's a lot for one woman,

but that's nothing compared to our friend

from earlier, Moulay Ismail.

According to records, he had four wives

and 500 women in his harem,

but there are factors that not even an emperor

can control, like how a man's sperm becomes less mobile

and more abnormal as he grows older,

which ultimately reduces his chances

of fathering children later in life.

In fact, studies suggest that men over 50

have an up to 38% lower chance

of impregnating a woman

compared to men under 30.

For Ismail, he fathered most

of his children relatively young,

so by age 57, he had an estimated

1,171 kids.

But he wasn't the only man in history

with tons of progeny.

Augustus the Strong was king of 18th-century Poland,

and he had a long distance relationship with his wife.

So, of course that didn't stop him

from fathering a rumored 370 children by mistresses,

and Genghis Khan, notorious for conquering large areas

of 13th-century Asia

is estimated to have had between 1,000 and 2,000 children.

In fact, by tracking types of Y chromosomes,

scientists estimate that up to 16 million men today,

who live in regions that Khan conquered,

could have been descendants of him

or his close male relatives.

But did these men really reach

their maximum human possibility?

Turns out the records on Ismail

only spanned 32 years of his life.

By one calculation, he really could have had hundreds more.

If you compare that to men in more modern times,

the most prolific fathers today

have about 200 children.

That's nowhere near 1,171,

and honestly, it's probably for the best.