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safe2216348 artist:joycall6590 part of a set25116 princess celestia114762 princess luna119188 series:joycall6's periodic table135 g42070565 blushing283519 cute272161 cutelestia4361 duo187134 duo female36571 duo focus2695 ethereal mane14161 female1851675 glow in the dark158 glowing20665 glowing horn30004 horn214380 light2373 lunabetes4494 magic99012 mare771764 open mouth247244 periodic table241 pink-mane celestia3194 royal sisters7106 siblings23568 sisters19180 terbium5 weapons-grade cute4785

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Parcly Taxel
Parcly Taxel - For supporting the site
Silly Pony - Celebrated the 13th anniversary of MLP:FIM, and 40 years of MLP!
Flower Trio - Helped others get their OC into the 2023 Derpibooru Collab.
Roseluck - Had their OC in the 2023 Derpibooru Collab.
Tree of Harmony - Drew someone's OC for the 2022 Community Collab
Elements of Harmony - Had an OC in the 2022 Community Collab
Philomena - For helping others attend the 2021 community collab
Twinkling Balloon - Took part in the 2021 community collab.
Ten years of changes - Celebrated the 10th anniversary of MLP:FiM!
Happy Derpy! - For Patreon supporters

Princess of Science
Terfenol-D is a terbium/iron/dysprosium (more on that last component later) alloy responding to magnetic fields by stretching and shrinking. In particular, the later lanthanides are renowned for their magnetic properties and therefore what they give to more conventional magnets, either added strength or retaining power (vis-à-vis their fields). The very late ones reaching into 5d serve as generic refractory metals though.