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“The presence of ferrihydrite tells us something specific about Mars' past environment,” Valentinas said, describing the cold and pH neutral waters that must have existed to oxidize the soil.

When olive oil is exposed to fluctuations in temperature, light and air, which oxidizes the oil to its detriment, its quality diminishes.

Bacteria, fungi, and plants use this enzyme to oxidize alcohols.

This suggested that microscopic plankton living on the surface of the seas produce sulfur in the form of a gas, dimethyl sulphide, that once in the atmosphere, oxidizes and forms small particles called aerosols.

This process poses challenges including selective addition of bromine at the ortho position, difficulty working with certain chemical groups, and the tendency of o-bromobenzenethiols to oxidize easily in air releasing unpleasant odors.