![Munich, Germany. 20th May, 2019. An employee of the Physikalisch-Technische Bundesanstalt (PTB) fetches a glass cylinder with a high-purity silicon ball weighing exactly one kilogram from a transport box at the Deutsches Munich, Germany. 20th May, 2019. An employee of the Physikalisch-Technische Bundesanstalt (PTB) fetches a glass cylinder with a high-purity silicon ball weighing exactly one kilogram from a transport box at the Deutsches](https://c8.alamy.com/comp/T9P012/munich-germany-20th-may-2019-an-employee-of-the-physikalisch-technische-bundesanstalt-ptb-fetches-a-glass-cylinder-with-a-high-purity-silicon-ball-weighing-exactly-one-kilogram-from-a-transport-box-at-the-deutsches-museum-the-sphere-has-a-diameter-of-937-centimeters-and-is-cut-from-a-single-crystal-in-the-future-the-sphere-can-be-used-to-determine-what-a-kilogram-is-credit-sven-hoppedpaalamy-live-news-T9P012.jpg)
Munich, Germany. 20th May, 2019. An employee of the Physikalisch-Technische Bundesanstalt (PTB) fetches a glass cylinder with a high-purity silicon ball weighing exactly one kilogram from a transport box at the Deutsches
![Dead by Daylight on Twitter: "We are pushing a PTB update on Thursday June 13th at 11AM EDT. To learn more about the Ghost Face changes: https://t.co/PvBmHiSuU9 https://t.co/NRKUmpBFqA" / Twitter Dead by Daylight on Twitter: "We are pushing a PTB update on Thursday June 13th at 11AM EDT. To learn more about the Ghost Face changes: https://t.co/PvBmHiSuU9 https://t.co/NRKUmpBFqA" / Twitter](https://pbs.twimg.com/media/D84sdIqXoAEXp0b.jpg:large)
Dead by Daylight on Twitter: "We are pushing a PTB update on Thursday June 13th at 11AM EDT. To learn more about the Ghost Face changes: https://t.co/PvBmHiSuU9 https://t.co/NRKUmpBFqA" / Twitter
![Munich, Bavaria, Germany. 20th May, 2019. Dr. Dr. JENS SIMON of the PTB. The Deutsches Museum of Munich presented today a sphere called "The Roundest Object in the Universe"" - a sphere Munich, Bavaria, Germany. 20th May, 2019. Dr. Dr. JENS SIMON of the PTB. The Deutsches Museum of Munich presented today a sphere called "The Roundest Object in the Universe"" - a sphere](https://c8.alamy.com/comp/T9P09B/munich-bavaria-germany-20th-may-2019-dr-dr-jens-simon-of-the-ptb-the-deutsches-museum-of-munich-presented-today-a-sphere-called-the-roundest-object-in-the-universe-a-sphere-made-of-silicium-from-the-physikalisch-technischen-bundesanstalt-nationales-meteorologieinstitut-the-sphere-has-an-diameter-of-exactly-937cm-and-a-weight-of-1000045904kg-plus-or-minus-0000055gram-the-sphere-is-significant-as-it-displays-a-new-era-of-exact-measurements-and-physical-constants-that-were-ratified-on-may-20th-2019-the-introduction-of-these-sphere-officially-retires-the-paris-kilogram-T9P09B.jpg)
Munich, Bavaria, Germany. 20th May, 2019. Dr. Dr. JENS SIMON of the PTB. The Deutsches Museum of Munich presented today a sphere called "The Roundest Object in the Universe"" - a sphere
PLOS ONE: Spatial-temporal clustering of notified pulmonary tuberculosis and its predictors in East Gojjam Zone, Northwest Ethiopia
![PTB Institute Exterior in Berlin, Germany Editorial Stock Photo - Image of sign, scientific: 150424298 PTB Institute Exterior in Berlin, Germany Editorial Stock Photo - Image of sign, scientific: 150424298](https://thumbs.dreamstime.com/z/berlin-germany-february-signage-physikalisch-technische-bundesanstalt-institute-ptb-national-metrology-federal-republic-150424298.jpg)
PTB Institute Exterior in Berlin, Germany Editorial Stock Photo - Image of sign, scientific: 150424298
![Olade and PTB make available to the energy sector community the document: Quality Infrastructure for Energy Efficiency Programs in Latin America and the Caribbean. - Extranet Olade and PTB make available to the energy sector community the document: Quality Infrastructure for Energy Efficiency Programs in Latin America and the Caribbean. - Extranet](http://extranet.olade.org/wp-content/uploads/2019/05/Documento_posicion.jpg)
Olade and PTB make available to the energy sector community the document: Quality Infrastructure for Energy Efficiency Programs in Latin America and the Caribbean. - Extranet
![Therapeutically viable generation of neurons with antisense oligonucleotide suppression of PTB | Nature Neuroscience Therapeutically viable generation of neurons with antisense oligonucleotide suppression of PTB | Nature Neuroscience](https://media.springernature.com/full/springer-static/image/art%3A10.1038%2Fs41593-021-00864-y/MediaObjects/41593_2021_864_Fig1_HTML.png)
Therapeutically viable generation of neurons with antisense oligonucleotide suppression of PTB | Nature Neuroscience
![Time sequence of active PTB registration rates from 2007 to 2019 in... | Download Scientific Diagram Time sequence of active PTB registration rates from 2007 to 2019 in... | Download Scientific Diagram](https://www.researchgate.net/publication/343998629/figure/fig1/AS:938110439415808@1600674366050/Time-sequence-of-active-PTB-registration-rates-from-2007-to-2019-in-Henan-Province-China.png)
Time sequence of active PTB registration rates from 2007 to 2019 in... | Download Scientific Diagram
![Munich, Germany. 20th May, 2019. Jens Simon, press spokesperson at the Physikalisch-Technische Bundesanstalt (PTB), hands over a high-purity silicon sphere weighing exactly one kilogram at the Deutsches Museum to Daniela Schneevoigt, curator Munich, Germany. 20th May, 2019. Jens Simon, press spokesperson at the Physikalisch-Technische Bundesanstalt (PTB), hands over a high-purity silicon sphere weighing exactly one kilogram at the Deutsches Museum to Daniela Schneevoigt, curator](https://c8.alamy.com/comp/T9P00T/munich-germany-20th-may-2019-jens-simon-press-spokesperson-at-the-physikalisch-technische-bundesanstalt-ptb-hands-over-a-high-purity-silicon-sphere-weighing-exactly-one-kilogram-at-the-deutsches-museum-to-daniela-schneevoigt-curator-of-physics-at-the-deutsches-museum-the-sphere-has-a-diameter-of-937-centimeters-and-is-cut-from-a-single-crystal-in-the-future-the-sphere-can-be-used-to-determine-what-a-kilogram-is-credit-sven-hoppedpaalamy-live-news-T9P00T.jpg)
Munich, Germany. 20th May, 2019. Jens Simon, press spokesperson at the Physikalisch-Technische Bundesanstalt (PTB), hands over a high-purity silicon sphere weighing exactly one kilogram at the Deutsches Museum to Daniela Schneevoigt, curator
![Munich, Germany. 20th May, 2019. An employee of the Physikalisch-Technische Bundesanstalt (PTB) holds a glass cylinder with a high-purity silicon sphere weighing exactly one kilogram in the Deutsches Museum. The sphere has Munich, Germany. 20th May, 2019. An employee of the Physikalisch-Technische Bundesanstalt (PTB) holds a glass cylinder with a high-purity silicon sphere weighing exactly one kilogram in the Deutsches Museum. The sphere has](https://c8.alamy.com/comp/T9P017/munich-germany-20th-may-2019-an-employee-of-the-physikalisch-technische-bundesanstalt-ptb-holds-a-glass-cylinder-with-a-high-purity-silicon-sphere-weighing-exactly-one-kilogram-in-the-deutsches-museum-the-sphere-has-a-diameter-of-937-centimeters-and-is-cut-from-a-single-crystal-in-the-future-the-sphere-can-be-used-to-determine-what-a-kilogram-is-credit-sven-hoppedpaalamy-live-news-T9P017.jpg)
Munich, Germany. 20th May, 2019. An employee of the Physikalisch-Technische Bundesanstalt (PTB) holds a glass cylinder with a high-purity silicon sphere weighing exactly one kilogram in the Deutsches Museum. The sphere has
![Munich, Germany. 20th May, 2019. A high-purity silicon sphere (l) of the Physikalisch-Technische Bundesanstalt (PTB) weighing exactly one kilogram can be seen in the Deutsches Museum next to a copy of the Munich, Germany. 20th May, 2019. A high-purity silicon sphere (l) of the Physikalisch-Technische Bundesanstalt (PTB) weighing exactly one kilogram can be seen in the Deutsches Museum next to a copy of the](https://c8.alamy.com/comp/T9P00C/munich-germany-20th-may-2019-a-high-purity-silicon-sphere-l-of-the-physikalisch-technische-bundesanstalt-ptb-weighing-exactly-one-kilogram-can-be-seen-in-the-deutsches-museum-next-to-a-copy-of-the-original-kilogram-the-sphere-has-a-diameter-of-937-centimeters-and-is-cut-from-a-single-crystal-in-the-future-the-sphere-can-be-used-to-determine-what-a-kilogram-is-credit-sven-hoppedpaalamy-live-news-T9P00C.jpg)
Munich, Germany. 20th May, 2019. A high-purity silicon sphere (l) of the Physikalisch-Technische Bundesanstalt (PTB) weighing exactly one kilogram can be seen in the Deutsches Museum next to a copy of the
![Munich, Bavaria, Germany. 20th May, 2019. Dr. Dr. JENS SIMON of the PTB. The Deutsches Museum of Munich presented today a sphere called "The Roundest Object in the Universe"" - a sphere Munich, Bavaria, Germany. 20th May, 2019. Dr. Dr. JENS SIMON of the PTB. The Deutsches Museum of Munich presented today a sphere called "The Roundest Object in the Universe"" - a sphere](https://c8.alamy.com/comp/T9P0A1/munich-bavaria-germany-20th-may-2019-dr-dr-jens-simon-of-the-ptb-the-deutsches-museum-of-munich-presented-today-a-sphere-called-the-roundest-object-in-the-universe-a-sphere-made-of-silicium-from-the-physikalisch-technischen-bundesanstalt-nationales-meteorologieinstitut-the-sphere-has-an-diameter-of-exactly-937cm-and-a-weight-of-1000045904kg-plus-or-minus-0000055gram-the-sphere-is-significant-as-it-displays-a-new-era-of-exact-measurements-and-physical-constants-that-were-ratified-on-may-20th-2019-the-introduction-of-these-sphere-officially-retires-the-paris-kilogram-T9P0A1.jpg)