Which scientific company's logo underwent a significant redesign in 2019, changing from a stylized red 'X' to a circular symbol representing the mathematical concept of 'pi'?

Scientific companies often use distinctive logos to represent their brand identity and values. These corporate symbols not only serve marketing purposes but can also reflect the evolution of scientific thinking and technological advancement over time. Test your knowledge of how major scientific brands have visually represented themselves to the world through their iconic logos.

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Thermo Fisher Scientific
MilliporeSigma (Merck KGaA)
Bio-Rad Laboratories
Agilent Technologies