# Summary of #hplusroadmap IRC Log (March 30, 2015)

* Chris_99 and nmz787_i discussed spectroscopy methods for measuring alcohol content, including using NIR spectroscopy with a key absorption peak at 900nm, which would allow using cheaper silicon sensors rather than InGaAs sensors for longer wavelengths.

* They explored alternative alcohol measurement techniques including oscillating U-tube density meters (which are expensive but might be DIY-able with piezo components) and electrochemical breathalyzer sensors that function like fuel cells.

* Kanzure shared several security-related links about cryptographic backdooring, including "Malicious SHA-1" and a paper on backdoors discovered in military chips through silicon scanning.

* Heath shared a link to Science for the Masses, a group that was experimenting with night vision eye drops, showing interest in DIY biohacking approaches.

* Gene_hacker and kanzure briefly discussed the potential of supramolecular chemistry and synthetic approaches as alternatives to protein-based nanotechnology, with gene_hacker suggesting that synthesis machines could create complex molecular structures.

* CaptHindsight shared information about printable circuits using conductive ink (AGIC Circuit Printer), which led to a discussion about methods for connecting components to paper circuit boards.

* Nmz787_i inquired about potential off-label uses of LASIK technology for removing scar tissue from eardrums to potentially improve frequency response.