https://ana.ir/en/news/11156/why-teeth-change-color-and-how-to-restore-their-whiteness2026-08-12T18:00:02+03:30Why teeth change color and how to restore their whitenessana.pressenhttps://ana.ir/media/0f862679ZTp3ZWJwfGY6MTE3Nzg0OC5qcGd8ZnVpOjgwODA0fGw6ZW58djox.webpWhy teeth change color and how to restore their whiteness(Tehran Ana)- Tooth discoloration is a natural part of aging, but factors such as diet, smoking, dental plaque and certain medications can also affect tooth color, a dentist says.https://ana.ir/en/news/11155/robot-dogs-could-soon-replace-security-guards2026-08-12T17:13:39+03:30Robot dogs could soon replace security guardsana.pressenhttps://ana.ir/media/8ed7775bZTp3ZWJwfGY6MTE3Nzg0Ny5qcGd8ZnVpOjgwODAzfGw6ZW58djox.webpRobot dogs could soon replace security guards(Tehran Ana)- AI-powered robotic dogs are emerging as a cost-effective security option, patrolling data centers, protecting valuable crops and securing stadiums, while raising concerns about the future of human security jobs.https://ana.ir/en/news/11154/new-underwater-adhesive-gets-stronger-in-water2026-08-12T17:07:46+03:30New underwater adhesive gets stronger in waterana.pressenhttps://ana.ir/media/d932857bZTp3ZWJwfGY6MTE3Nzg0Ni5qcGd8ZnVpOjgwODAyfGw6ZW58djox.webpNew underwater adhesive gets stronger in water(Tehran Ana)- Engineers have developed a powerful underwater adhesive that bonds surfaces in just 10 seconds, remains durable for years and can be partially reused while maintaining its strength.https://ana.ir/en/news/11153/scientists-develop-material-that-could-transform-battery-technology2026-08-12T16:58:24+03:30Scientists develop material that could transform battery technologyana.pressenhttps://ana.ir/media/257eb7daZTp3ZWJwfGY6MTE3Nzg0NS5qcGd8ZnVpOjgwODAxfGw6ZW58djox.webpScientists develop material that could transform battery technology(Tehran Ana)- Scientists at Saratov State University have developed a new material that could accelerate battery charging by 1.5 times while increasing energy capacity more than fivefold, according to preliminary findings.