Want to start a startup? Get funded by Y Combinator. March This essay is derived from a talk at the Harvard Computer Society. You need three things to create a successful startup: Most startups that fail do it because they fail at one of these. A startup that does all three will probably succeed. And that’s kind of exciting, when you think about it, because all three are doable. And since a startup that succeeds ordinarily makes its founders rich, that implies getting rich is doable too. If there is one message I’d like to get across about startups, that’s it.
Age of the universe
His calculations did not account for heat produced via radioactive decay a process then unknown to science or, more significantly, convection inside the Earth, which allows more heat to escape from the interior to warm rocks near the surface. For biologists, even million years seemed much too short to be plausible. In Darwin’s theory of evolution , the process of random heritable variation with cumulative selection requires great durations of time.
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A single watch or clock for the entire class will do. Return to top PART 1: After students have decided how to establish the relative age of each rock unit, they should list them under the block, from most recent at the top of the list to oldest at the bottom. The teacher should tell the students that there are two basic principles used by geologists to determine the sequence of ages of rocks. Younger sedimentary rocks are deposited on top of older sedimentary rocks.
Principle of cross-cutting relations: Any geologic feature is younger than anything else that it cuts across. For example, U is an unstable isotope of uranium that has 92 protons and neutrons in the nucl eus of each atom. Through a series of changes within the nucleus, it emits several particles, ending up with 82 protons and neutrons. This is a stable condition, and there are no more changes in the atomic nucleus.
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Cosmic age problem and Cosmic microwave background In the 18th century, the concept that the age of the Earth was millions, if not billions, of years began to appear. However, most scientists throughout the 19th century and into the first decades of the 20th century presumed that the universe itself was Steady State and eternal, with maybe stars coming and going but no changes occurring at the largest scale known at the time.
The first scientific theories indicating that the age of the universe might be finite were the studies of thermodynamics , formalized in the mid th century. The concept of entropy dictates that if the universe or any other closed system were infinitely old, then everything inside would be at the same temperature, and thus there would be no stars and no life. No scientific explanation for this contradiction was put forth at the time.
In Albert Einstein published the theory of general relativity  and in constructed the first cosmological model based on his theory. In order to remain consistent with a steady state universe, Einstein added what was later called a cosmological constant to his equations. Einstein’s model of a static universe was in addition proved unstable by Arthur Eddington.
The first direct observational hint that the universe has a finite age came from the observations of ‘ recession velocities ‘, mostly by Vesto Slipher , combined with distances to the ‘ nebulae ‘ galaxies by Edwin Hubble in a work published in In addition, these galaxies were very large and very far away. Spectra taken of these distant galaxies showed a red shift in their spectral lines presumably caused by the Doppler effect , thus indicating that these galaxies were moving away from the Earth.
In addition, the farther away these galaxies seemed to be the dimmer they appeared to us the greater was their redshift, and thus the faster they seemed to be moving away. This was the first direct evidence that the universe is not static but expanding.
10 of the Best Things You Can Do for Your Sexual Self (at Any Age)
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Jim June 13, Marni I am sorry if I have taken to much space in your blog? Mae and I had a soulmate love affair! We had a couple drinks to celebrate then I carried Mae to bed. We made love and fell asleep in each others arms! I got up dressed went home jumped in the shower my wife joined me I carried her to bed and made love to her on my birthday in the morning! Jim June 10, Part 5 The reason it worked for Mae and I was the 38 years between us didnt bother us and since my wife was busy with work and allowed me to be oncall for Mae it was great.
Mae loved that from the first time I made love to her I would call her and thank her for a great time. I told her after the second month that I loved her and her response was I care for you very much. Finally on our 1st anniversary of our affair my wife was away on business Mae and I went out for dinner I brought her roses and back to my house.
I carried her up to bed and made love to her I told her I loved her and she finally said I love you. Mae and I make up a list of fix it projects to keep me coming for Mae!
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Honesty, like most things, starts at home: in other words, with yourself. Sex can be a veritable minefield when it comes to game-playing, delusion, manipulation and control, even when no one intends any of .
Want or need to talk one-on-one? If we look at it another way, it appears a million times more complicated. While it’s important that we bear everything in mind we need to in terms of infection and disease, birth control , our relationships, our bodies and the whole works, now and then we need to remember the bare bones and the human element of the thing, and keep the essentials in the forefront of our minds.
Choose yourself as your first partner We hear a whole lot about who should be our first partner. Most of the time, we’re told it should be someone we love and who loves us back, someone committed to us long-term, perhaps even someone we plan to spend the rest of our lives with. I agree completely, because you, all by yourself, have all of those qualities, more than any other person ever can. Flick the switch in your head that says masturbation or self-love is only something we do when we don’t have a partner available.
Lots of people with partners still masturbate, including people having great shared sex lives with those partners. Even when you have a partner in your life, you’ll discover that there are things you’ll do, and responses you’ll have, only when you’re your own lover. Treat your time alone as special time, the same way you’d rev yourself up for a date with someone else. Sounds hokey, but the truth is that some of the best sex you’ll ever have is sex with yourself, and when you do have a partner, sex with them will be all the better for that.
No one is ever going to know your body like you are, and no one else is ever going to be able to GET to know your body well unless you do to begin with. Really claiming and recognizing yourself as your first and foremost sex partner is a powerful thing. It equips you with some tools for healthy sexuality and balanced relationships for the rest of your life:
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References Generic Radiometric Dating The simplest form of isotopic age computation involves substituting three measurements into an equation of four variables, and solving for the fourth. The equation is the one which describes radioactive decay: The variables in the equation are: Pnow – The quantity of the parent isotope that remains now.
This is measured directly. Porig – The quantity of the parent isotope that was originally present.
Sep 29, · If I could prolong my time as a young adult by, say, years, here is a list of things I would like to do: • Go to more parties. Preferably wild parties that I can think about, years later, at.
SHARE In spring , parents in the normally progressive Bay Area city of Fremont, California, started a campaign to get a book removed from the 9th grade curriculum for the five district high schools, arguing it was inappropriate for their 13 and year olds. They hired a local lawyer and put together a petition with more than signatures. It offers the traditional advice and awkward diagrams plus some considerably more modern tips: And then there was this: Most sex games are safe and harmless, but partners need to openly discuss and agree beforehand on what they are comfortable doing.
She needs to know how boys feel. They argue that even relatively modern sex ed has even not begun to reckon with what kids are now exposed to in person and online. The singer Rihanna, for example, has legions of young fans. Everyone is feeling a little awkward. The book has been shelved, at least for this year. The Fremont showdown is a local skirmish in what has become a complicated and exhausting battle that schools and parents are facing across the nation. How, when, and what to tell kids about sex today?