A useful technology developed from scientific observations on the nano scale is carbon nanotubes for stain-resistant clothes. Carbon nanotubes (CNTs) are cylindrical structures made of carbon atoms arranged in a hexagonal lattice, exhibiting remarkable strength, electrical conductivity, and thermal properties. These characteristics have led to innovative applications, including the development of stain-resistant and durable textiles. This technology leverages properties observed at the nano scale to enhance everyday clothing.
The other options, while significant in their respective fields (the Kepler telescope in astronomy and photometers in various measurements), are not directly related to technological advancements derived from observations at the nano scale.
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