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When can a Wimbledon player challenge a call, what is Hawk-Eye and how many challenges do players get? | The Sun
![Project Invent on Twitter: "A key part of making for others is #empathy, so every Monday, Project Invent will be releasing Micro #Maker empathy challenges for kids to try out! This week: Project Invent on Twitter: "A key part of making for others is #empathy, so every Monday, Project Invent will be releasing Micro #Maker empathy challenges for kids to try out! This week:](https://pbs.twimg.com/media/EVf1FzkUEAEtbfJ.jpg)
Project Invent on Twitter: "A key part of making for others is #empathy, so every Monday, Project Invent will be releasing Micro #Maker empathy challenges for kids to try out! This week:
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