In terms of the current four majors, the first to win all four in a single year was Don Budge, who completed the feat in 1938. To date, 17 players have completed a Grand Slam, though only six in the most prestigious singles titles. Of these players, three have won multiple majors: Rod Laver accomplished the feat twice in men's singles; Margaret Court accomplished the feat three times, in two different disciplines -- once in women's singles and twice in mixed doubles; and Esther Vergeer completed a grand slam twice in Women's wheelchair doubles.
has anyone won all four grand slam in one year?
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Answer: yes

The blastocyst is a structure formed in the early development of mammals. It possesses an inner cell mass (ICM) which subsequently forms the embryo. The outer layer of the blastocyst consists of cells collectively called the trophoblast. This layer surrounds the inner cell mass and a fluid-filled cavity known as the blastocoele. The trophoblast gives rise to the placenta. The name ''blastocyst'' arises from the Greek blastos (''a sprout'') and kystis (''bladder, capsule'').
does the entire blastocyst develop into a fetus?
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Answer: no

Components of an electrical circuit or electronic circuit can be connected in many different ways. The two simplest of these are called series and parallel and occur frequently. Components connected in series are connected along a single path, so the same current flows through all of the components. Components connected in parallel are connected along multiple paths, so the same voltage is applied to each component.
is the voltage the same in a parallel circuit?
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Answer:
yes