The conceptofoilsourceabundanceindex is presentedby combiningorganicabundance of sourcerock with geologicalanalysis, and applied in Southwestdepression of Tarim basin.
However, as Michael Meyer suggests, the discovery does raise many questions, including whether the source and abundance of water could serve as a resource in future missions to explore Mars.
Honestly, this is no big deal with lightweight in-ears, but many audiophiles prefer cans with open-backs or higher impedances, which respond best to an abundance of energy from the source device.