Which design innovation revolutionized laboratory centrifuges in the 1970s, making them significantly more versatile for scientific research?

Laboratory centrifuges are essential tools in scientific research, medical diagnostics, and industrial applications. These devices separate components of different densities in liquid samples through centrifugal force. From their humble beginnings to modern sophisticated instruments, centrifuges have undergone remarkable design evolution to meet increasingly specialized scientific needs. Test your knowledge about this critical scientific instrument's design history!

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Microprocessor controls allowing precise programmable speeds and times
Introduction of plastic components replacing all metal parts
Solar-powered operation for field research applications
Bluetooth connectivity for remote monitoring