这一天，老大我去课后班那里，接到了小冲浪。。。
刚上车，我们都还在系安全带，。。。
小冲浪就很开心地跟老大我说，“I know two reasons why people don't feel the earth is a sphere.”
“OK.”老大我回应，听他继续说。。。
“First, the earth's surface only curves slightly so that people don't feel the ground is curving.”他说。
“Good.”我们俩都系好了安全带，老大我一边启动了车，一边补充说，“That's because the earth's radius or diameter is _huge_.”
“Second, when people look far at the horizon, they can't see a circle.”他又说。
“Well, we live in a valley.”老大我说，“When we look around, we can see the mountains and their mountain tops dominate the skyline. What do people see on a boat in the sea or ocean?”
“People cannot see that far. They will need telescopes to see far.”小冲浪想了想，说。
“OK.”老大我说，一边开车，一边心想，也许是时候该带他去坐船出海了？
******
“Dad,”在车上过了一会儿，小冲浪又很开心地跟老大我说，“I'm smart, right？”
“Yeah.”老大我给了一个肯定的回答，淡市，没有太热烈响应，有点担心小盆友翘尾巴。。。
“I knew you'd agree!”小冲浪很兴奋地说，“I think my IQ is 100!”
“You think the IQ of 100 means very smart?”老大我忍住笑，问他。。。
“Of course!”小冲浪自信的话音很有感染力。。。
老大我忍住笑，没有再说什么。。。
或许，他以为老大我被他说服了吧，他也没有再说什么。。。
2025.9
