Because when you have a friend that's all about science, you use him to dump all your curiosity on him.
I got bored of the different route chapters. My apple pen is out of batteries. I got sunburns. Let's write some wholesome science! This all happened pre-petrification, but each scenes will be at different times of the characters' relationship.

It was in between classes, Senku just got himself an energy drink and you were looking out the window, towards the grey clouds covering the sky.
"Senku?" you asked, not looking away.
"Mmh?"
"Why are some clouds grey and others white?"
"Huh, I don't get that one often." he stood beside you. "You see how the sun's light is white but it's just a mix of the electro magnetic waves that make the colors of the rainbow?"
"Yeah."
Of course, you didn't actually know. But you did remember the white light thing.

"When the light enters the atmosphere, it comes across a bunch of obstacles, like air and the clouds. Clouds are water and ice molecules, and when they get hit by the light, they deflect it in all other directions. That's why they look white, like the sunlight."
"Oh~." you nodded. "But what about those?" you gestured towards the sky.
"Okay, example: the cumulonimbus stretches for around 15kms in height. So the sunlight is all absorbed at the top of it, and the bottom received little to no light. That's why they're grey."
"Damn~ dude!" your eyes widen as you smiled. "Those clouds be thick!"
He chuckled.

When you and Senku started to become friends, he'd always call you to help out whenever Taiju wasn't available. Because it was summer and his air conditioner was broken (his dad was taking care of it), he decided to work on his new science project outside in his backyard. And you were surprised to see the various plants and colorful flowers, some of them were apparently rare species from different countries that he brought back from expedition he did in the past.
So of course, you were more focused on the garden than helping him out, not like he couldn't do it by himself. At the time, you suspected that he just didn't want to work alone (and you still did).

"Oh! Bees!" you exclaimed, observing them as they gathered the flowers' pollen.
"It's the season." Senku said, without looking up from his work.
You looked around. The bees seemed focused on those particular flowers.
"They seem to really like those."
"It's because they're blue."
"Huh?" you tilted your head.
"Yeah." he looked at you. "Recent studies have shown that bees are particularly sensible to the color blue. They're attracted to it."
"What, really?! Why?"
He put whatever he was working on aside and stood beside you. He took a flower petal and brought it close to your faces.
"See how they're stripped? Because of that, the sunlight hitting it is diffracted." he stopped himself, knowing you wouldn't know what this word meant. "Uh, basically the light's components, its colors, are separated. The human eyes can't see that, but bees do." he smiled. "To give you an idea of what they see, put a CD in front of a light."
"Let's do it now!"
Senku didn't complain as you both quickly went to his room to get whatever CD was closest and walked back out. You put the 'mirror' side to the light and let out an 'oh~' as you looked at the little rainbow effect.

"And so," Senku continued. "those petals generate this halo of light which attract the bees."
"Huh." you said. "So they don't actually see the color blue?"
"Nope. And they're not the only ones, look." you both looked back at the blue flowers. "You got bumblebees, and wild bees."
"Wild bees?!"
He pointed at one of the insects and you looked closely at it (not that close you fool). It was different from a normal bee, it was tinier and slimmer.
"I didn't even know they were a thing!" you said.
"They fly solo and live in hollow stems or under tree barks, some even live underground."
You gave him a wide-eyed look, it made him smile.
"I made a little hotel for them."
He gestured towards the garden's fence, hung on it was some kind of shelter, similar to those for birds, except this one was filled with thin wooden tubes.
"It's safer." he added.
"You did it yourself?"
"'course not, I asked the old carpenter down the street for help."
"...Could we go and ask him to do one for my house too one day?" you asked with puppy dog eyes.
"We could go now."
"But what about your project?"
"(Y/n), with this weather, I'd rather do literally *anything else* than working on assembling a super computer made of hot ass metal!"
You laughed.

In the beginning of high-school, this was when you spent more time with each-other. And you realized how it brought you closer, on one specific night.
Senku got his new telescope and, great timing, there was a meteor shower tonight. So you both went to the bus' last stop, to the hills and found a nice clearing at the top of one of them. Perfect for stargazing. You took this outing as more of a picnic so while Senku was setting up his telescope and took out his notebook to note his observations, you sat on the grass and started to unpack your dinner.
"Did you know that shooting stars weren't stars at all?"
"Huh?" you looked up at him.
He was looking up at the sky as he talked.

"Meteor showers happen when the earth enters an area where there's a lot of dust, left by comets as they travel through the universe. The dust gets into our atmosphere, the heavy friction makes them combust and they make what we call shooting stars."
You were both silent for a moment. You were still surprised, but not by what he said.
"That-" you laughed. "That somehow makes it less cool!"
"What do you mean?!" he faced you. "Did you not hear when I said "combust"?! Do you not know what that means?!"
"I do! But it's some lame space dust!" you kept laughing.
"*Space* dust (Y/n)! SPACE dust!!!"
"Oh, whatever." you pointed up. "It's starting!"

During the majority of the meteor shower, you both talked very little. You'd glance at him from time to time, wondering if he realized what he did. It was the very first time Senku went into one of his explanations by himself, you didn't have to ask anything. He explained because he wanted to share this piece of knowledge with you. He opened more to you. You felt your heart warming up thinking about it.

The PE teacher wasn't there that day, sadly, it meant that you had to wait two hours for the next class. Your favorite arcade was closed, you forgot your melodica at home, Yururiha was sick and Taiju was visiting his grandma in the country, so you and Senku were sitting in class in silence, with you sitting in front of his desk across from him. Senku didn't mind of course, reading a book straight up vibin', but you were bored to no end! And making beats by hitting the table with your pen got old after an hour and a half. You got so bored, you took your empty soda can and held it to your ear.

"Dude!!!"
Senku flinched as you leaned closer to him, suddenly full of energy.
"The can, it sounds like a seashell! Check this out!"
You held it to his ear, he listened for a second before pushing it away.
"Of course it does." he said. "You do know that what you're hearing isn't *actually* going from the seashell right?"
"Of course! I'm not stupid." you frowned. "But then tell me, how does the whole 'hearing the sea' thing works?" you rested your head on the palm of your hand as you leaned on the desk.
"What you're hearing is actually your blood vessels circling through your body, the seashell works as a sound box. When you put it to your ear, it picks up the sound that spreads through the auditory canal. It bounces on the inside of the shell and amplifies it." he took the can from you and put it to your ear again. "If I doesn't move, you just hear some kind of background noise. But if I do," he moved the can at a slow rhythm. "you get a variation of the sound that reminds you of the sea."
"Oh~ I get it." you smiled as he went back to his book.

Yeah nothing special happened. But those moment where one of the reasons why you liked Senku. He made you curious about the world around you. He provided an explanation no matter how stupid the question sounded, because he knew the answer would be more complex than it seemed. It made you appreciate science as well, and it made you understand why he was so passionate about it.
To this day, you'd still share your curiosity with him.