Science that humans once understood but no longer

Astrology.

What else?

Calories in vs out is what makes you fat.

3 Likes

how to build pyramids

Two genders.

4 Likes

Greek fire.

 

Still some debate as to what it was actually composed of.

"It is, however, a common practice with the vulgar to slander everything which is difficult of attainment, and surely they who condemn the first of these two studies must be considered totally blind, whatever arguments may be produced in support of those who impugn the second. There are also persons who imagine that whatever they themselves have not been able to acquire, must be utterly beyond the reach of all understanding; while others again will consider as useless any science of which (although they may have been often instructed in it) they have failed to preserve the recollection, owing to its difficulty of retention. In reference to these opinions, therefore, an endeavour shall be made to investigate the extent to which prognostication by astronomy is practicable, as well as serviceable, previously to detailing the particulars of the doctrine" - Ptolemy

 

CRE - Astrology.

What else?

And voodoo as well as dousing for boogie men

It's pee.

THERE ARE ONLY TWO GENDERS.

VTCO - 

THERE ARE ONLY TWO GENDERS.


also, reading more than just the op before responding

1 Like
CRE -

"It is, however, a common practice with the vulgar to slander everything which is difficult of attainment, and surely they who condemn the first of these two studies must be considered totally blind, whatever arguments may be produced in support of those who impugn the second. There are also persons who imagine that whatever they themselves have not been able to acquire, must be utterly beyond the reach of all understanding; while others again will consider as useless any science of which (although they may have been often instructed in it) they have failed to preserve the recollection, owing to its difficulty of retention. In reference to these opinions, therefore, an endeavour shall be made to investigate the extent to which prognostication by astronomy is practicable, as well as serviceable, previously to detailing the particulars of the doctrine" - Ptolemy

 

Not sure if this counts as science but celestial navigation.

Application of sound waves

- acoustic levitation

- medical treatments

- sonic drilling (although that has recently been rediscovered)

 

1 Like
Meohfumado - 

Greek fire.

 

Still some debate as to what it was actually composed of.


Interesting.

Basic biology. 

Roman concrete?

NerveBlock -

Basic biology. 

Found the Nazi.

Fan of Fanboys -
VTCO - 

THERE ARE ONLY TWO GENDERS.


also, reading more than just the op before responding


Only 2 Genders. 


Also climate change and natural selection. 

Rashomon -

Application of sound waves

- acoustic levitation

- medical treatments

- sonic drilling (although that has recently been rediscovered)

 

They actually have lights that use a gas filled lamp, and some sort of emitter that excites the gas through sound waves.

Ive never worked on them personally, but they were supposed to make life for electricians a lot easier when it came to street lights since all we had to do was run power to the emitter at the base of the standard.  


Damascus steel

Damascus steel was the forged steelcomprising the blades of swords smithed in the Near East from ingots of Wootz steel[1]imported from India and Sri Lanka. These swords are characterized by distinctive patterns of banding and mottling reminiscent of flowing water, or in a "ladder" or "teardrop" pattern. Such blades were reputed to be tough, resistant to shattering, and capable of being honed to a sharp, resilient edge.[2]

The steel is named after Damascus, the capital city of Syria and one of the largest cities in the ancient Levant. It may either refer to swords made or sold in Damascus directly, or it may just refer to the aspect of the typical patterns, by comparison with  Damask fabrics (which are themselves named after Damascus).[3][4]

The original method of producing wootz is not known. Modern attempts to duplicate the metal have not been entirely successful due to differences in raw materials and manufacturing techniques. Several individuals in modern times have claimed that they have rediscovered the methods by which the original Damascus steel was produced.[5][6][7]

The reputation and history of Damascus steel has given rise to many legends, such as the ability to cut through a rifle barrel or to cut a hair falling across the blade.[8] A research team in Germany published a report in 2006 revealing nanowires and carbon nanotubes in a blade forged from Damascus steel.[9][10][11]Although many types of modern steel outperform ancient Damascus alloys, chemical reactions in the production process made the blades extraordinary for their time, as Damascus steel was superplastic and very hard at the same time. During the smeltingprocess to obtain Wootz steel ingots, woody biomass and leaves are known to have been used as carburizing additives along with certain specific types of iron rich in microalloying elements. These ingots would then be further forged and worked into Damascus steel blades. Research now shows that carbon nanotubes can be derived from plant fibers,[12] suggesting how the nanotubes were formed in the steel. Some experts expect to discover such nanotubes in more relics as they are analyzed more closely.[10]