According to the World Health Organization, which is part of the United Nations, more than 2 billion people around the world don’t have clean drinking water in their homes. That’s about 28 percent of the entire world’s population.

世界卫生组织隶属于，据世界卫生组织称，全世界有超过20亿人(约占全世界人口的28%)没有干净的饮用水。

And one threat that can hide in water is lead. It’s a toxic metal the U.S. government says no amount of it is safe, but there are some people working on ways to help others avoid it.

水中的一个潜在的威胁是铅。这是一种有毒的金属，美国政府说少量的铅不会造成危险的，但是有一些人正在设法帮助其他人避免这种物质。

GITANJALI RAO, INVENTOR: My name is Gitanjali Rao. I am 12 years old. I’m in seventh grade and I go to STEM School Highlands Ridge.

我的名字是Gitanjali Rao。今年12岁，上七年级，在STEM学校就读。

So I developed a device to detect lead in water fashioned in current techniques out there today. It uses nanotube-based sensor in order to give you instantaneous results on your smart phone of safe, slightly contaminated or critical of the lead status in your water.

所以我发明了一种仪器，可以检测出当今技术中的铅。它使用基于纳米管的传感器，以便在智能手机上立即获得水是安全、轻微污染或铅超标的及时反馈。

I was originally introduced to the Flint water crisis through a STEM lab. And it was just appalling to see the number of people who were affected by lead in water.

我最初是通过一个STEM实验室接触到Flint水危机的，看到很多人受到水里铅的影响，真是令人震惊。

I partnered with Denver Water and I am working on performing my tests and doing research there. So, at this point, I am working on redesigning the device structure, refining my sensors, adding various tables and charts for more accurate values.

我和Denver Water公司合作，我正在做我的测试并在那里做研究。因此，我正在重新设计设备结构，改进传感器，为更精确的值添加各种表格和图表。

I want to see this in the market so that every -- it’s in everyone’s hands in the next year.

我想在市场上可以看到这个设备——这样明年每个人就都可以拥有了。

According to the World Health Organization, which is part of the United Nations, more than 2 billion people around the world don’t have clean drinking water in their homes. That’s about 28 percent of the entire world’s population.

And one threat that can hide in water is lead. It’s a toxic metal the U.S. government says no amount of it is safe, but there are some people working on ways to help others avoid it.

(BEGIN VIDEOTAPE)

GITANJALI RAO, INVENTOR: My name is Gitanjali Rao. I am 12 years old. I’m in seventh grade and I go to STEM School Highlands Ridge.

So I developed a device to detect lead in water fashioned in current techniques out there today. It uses nanotube-based sensor in order to give you instantaneous results on your smart phone of safe, slightly contaminated or critical of the lead status in your water.

I was originally introduced to the Flint water crisis through a STEM lab. And it was just appalling to see the number of people who were affected by lead in water.

I partnered with Denver Water and I am working on performing my tests and doing research there. So, at this point, I am working on redesigning the device structure, refining my sensors, adding various tables and charts for more accurate values.

I want to see this in the market so that every -- it’s in everyone’s hands in the next year.