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The first version was made in the 1950's which contained a high level of oestrogen and progesterone. But soon, there were side effects of oestrogen like blood clots. Therefore, the pill right now has a lower dose of oestrogen so that means lower side effects.

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What was the first model of the atom was developed through?

The first model of the atom was developed through the discovery of subatomic particles such as electrons, protons, and neutrons. This led to the development of the planetary model of the atom proposed by Niels Bohr in 1913.


Who is the inventor of hydrogen bomb?

there were two contributors in this project there names were Edward teller and Stanislaw ulam who developed it in 1951 for the united states.


When was the program CU-SeeMe first developed?

The software program CU-SeeMe is a teleconferencing client that makes calls over the internet. It was written by Tim Dorsey on the Apple Macintosh platform in 1992.


What comes first in naming of covalent bonds?

When naming covalent bonds, you first put down the name of the first element. After that, you use a prefix for indicating the number of the atoms of the anion for which you use a suffix. Example: Carbon dioxide.


Who developed hydrogen bomb?

The first staged hydrogen bomb was developed by a team at Los Alamos, NM in 1952. It was not a practical bomb as it used cryogenic liquid deuterium-tritium and required a refrigeration system larger than itself to keep it cold.The first practical "hydrogen" bomb was developed by a team at Arzamas-16 in the USSR in 1953. It used dry lithium deuteride, however did not use staging like the 1952 US bomb did so its yield was limited. It was likely done mostly for propaganda purposes. In modern terminology it would be considered a dry boosted fission bomb, not a fusion (hydrogen) bomb.The first practical staged hydrogen bomb was developed by a team at Los Alamos, NM in 1954. It used dry lithium deuteride.The second practical staged hydrogen bomb was developed by a team at Arzamas-16 in the USSR in 1955. It used dry lithium deuteride.In the US the key central concepts of the hydrogen bomb were developed by Stanislaw Ulam and Edward Teller, in the USSR the same concepts were developed by Andre Sakharov.

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When were canoes first developed?

when were the first canoes developed


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The Phoenicians developed the first alphabet


Where were the first robots developed?

The first robots were developed in Japan.


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the first ROV was developed in 1953


Who developed the first soft-ware and how?

who developed the first soft ware and how


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What was the first war to take place?

define "war". as humans have developed and increased in number, this term has changed dramatically. literally, I would say Cain vs Abel.