< crap shoot >
#1

        [Image: BoneDice.jpg]
        Astragali (Bone Dice - see below)




                            < crap shoot >

        dad --> 20 to 200 million sperm
        mom --> 1 egg (97 times out of 100)
        100 to 200 sperm make it to the egg
        ...unless there's an added obstacle course (see Obstacle Course link below)
        1 makes it inside the egg

        6 fertile days per cycle (approx. 29.3 days - see Ovulatory Cycle below)
        38% of eggs fertilized after one cycle
        68% after three cycles
        1 in 7 fertilized eggs become kids
        after birth the odds get much better in France (see French Life Expectancy below)

                                - - -




image: Smithsonian Magazine



Obstacle courses:
Obstacle courses by severity (typical contraceptive use failure rates by type):
CDC List

OMG Sponges are terrible!
Seinfeld: Sponge-Worthy

612,613 Ovulatory Cycles:
Menstrual cycle is 29.3 days (average, see graph below)
Lunar phase cycle (new Moon to new Moon) is 29.5 days
Moon orbit of Earth is 27.3 days
Tidal cycle is 27.3 days

Real-world menstrual cycle characteristics:
[Image: Menstrual_Cycle.jpg]

From Nature Publication Paper:
"Real-world menstrual cycle characteristics of more than 600,000 menstrual cycles"
(612,613 ovulatory cycles with a mean length of 29.3 days from 124,648 users)
Because Science

French Life Expectancy:
[Image: French_Life_Expectancy.jpg]

From: L’Institut national d’études démographiques (Ined)
Even for the French

Astragali (Bone Dice):
Maresha is about 50km (30 miles) from the top of the Gaza Strip.
So around 323 B.C.E. the residents there were using tunnels to evade the Egyptians.

Map of Maresha

Archaeologists Uncover Hundreds of Ancient Dice Used for Divination and Gaming:

The ancient site of Maresha, now part of a national park in Israel, was once a thriving city with a subterranean secret. Beneath the shops and houses that snaked through the city was a vast network of underground caves, hewn into soft chalk and serving a variety of possible purposes, from sites of worship to grain stores to clandestine hideouts to gambling dens.

Now, a study recently published in the journal Levant sheds light on an intriguing discovery made within the cave complex: more than 600 animal knucklebones, which appear to have been used for divination—and for fun.

Researchers discovered the knucklebones in the Maresha-Bet Guvrin National Park, according to a statement from the Israel Antiquities Authority (IAA). Sourced from the remains of goats, sheep and cattle, the artifacts date to the Hellenistic period—which began with the death of Alexander the Great in 323 B.C.E.—and were made specifically from the astragalus, a small bone located in the tarsal joint of hooved animals.

These artifacts, called “astragali,” have been found in other locations around the ancient world, writes Ruth Schuster of Haaretz. But the Maresha astragali are notable for their “large quantity and good quality, and their many inscriptions,” says IAA zooarchaeologist Lee Perry-Gal, who co-authored the Levant paper, in the statement.

Twenty-four of the astragali were indeed etched with geometric shapes, numbers and Greek letters, reports Vittoria Benzine of Artnet. Some of the inscriptions, per the IAA, spell out the names of gods “associated with human wishes and desires”: These include Hera, goddess of marriage and women; Aphrodite and Eros, who were linked to fertility and love; and Nike, the goddess of victory.

Perry-Gal tells Haaretz that a large collection of astragali was discovered near a “small altar with wall etchings,” which suggests they were used in a ritual context—specifically divination, or the practice of discovering the will of the gods. Ancient peoples believed divine messages could be transmitted through a variety of mediums, including the entrails of dead animals, the stars, the behavior of birds and small bones or dice. “The underlying theory is that casting dice—or in this case, small bones—is a way to invoke or contact the superpowers,” writes Haaretz. Some of the bones were shaved down, perforated or filled with lead so they could be rolled more effectively.

Astragali themselves were thought to have protective powers; archaeologists have previously found the bones buried into the foundations of houses, likely because people believed they would bring good luck. The knucklebones have, for example, been found in the graves of children, suggesting that they were seen as tokens that would accompany their owners “to the next world, to be used there,” adds Perry-Gal.

And some of the astragali may have served a more lighthearted purpose: Inscribed with words and phrases like “Robber,” “Stop!” and “You are burnt,” they likely functioned as gaming dice. These finds are consistent with previous discoveries that point to astragali’s role in gaming.

Experts do not know who made the astragali—or who used them. “We couldn’t associate the find with a specific ethos,” Perry-Gal tells Haaretz. Between the fourth and second centuries B.C.E., the city was a multicultural hub populated by Phoenicians, Idumaeans, Nabataeans and Jews, among others. In other words: People.

Link to Article:
Bone Dice

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                                                                                                                a brightly colored fungus that grows in bark inclusions
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#2
the uterus has pockets that could keep sperm for up to a week i think?

and the egg itself is an obstacle course, though i'll need to revisit the notes for my developmental biology class for details xD
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#3
Thanks for suggesting further rabbit holes. See below Smile

(11-22-2023, 08:28 AM)RiverNotch Wrote:  the uterus has pockets that could keep sperm for up to a week i think?

"Average survival times for sperm and the ovum have been estimated to be 1.4 days and 0.7 days, respectively.
Sperm would have a 5% probability of surviving more than 4.4 days and a 1% probability of
surviving more than 6.8 days."

From:
"The probability of conception on different days of the cycle with respect to ovulation: an overview"
Probability of Conception


============
"Comparative studies in diverse species have revealed that long-term sperm storage (up to months
and years) within the female reproductive tract is relatively commonplace in reptiles, fishes, birds and
amphibians. Even among mammals, some species of bat have evolved mechanisms for storing
spermatozoa for several months in the uterus or oviduct so that they can mate in the autumn
but postpone fertilization until the spring."

"Mechanisms of sperm storage in the female reproductive tract: an interspecies comparison"
Sperm Storage




RiverNotch Wrote:and the egg itself is an obstacle course, though i'll need to revisit the notes for my developmental biology class for details xD

Oh my God! I won't even begin to put references and quotes in here, but the bio-mechanisms involved
in the egg's selection of a single sperm are not only interesting, but they're so complicated they make
my brain hurt. But, truth be known, topics like these have a pleasure to pain ratio of about 50 to 1
so the hurt is no big deal. In fact, that small chance of pain increases the thrill of the adventure.

Who knew reading scientific papers was so much like a bungee jumping?
                                                                                                                a brightly colored fungus that grows in bark inclusions
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