机器学习老师助手
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遇见字母表！学习字母与发音！
回到5000年前的尼罗河畔，探索一条河如何建立了一个文明。
发现动物和它们的家！从农场到大海到热带雨林。
深入原子，发现周期表是科学中最强大的速记本。
探索细胞是如何工作的：从膜到线粒体：以及为什么所有的生命都依赖于它们。
探讨气候变化的证据, 理解机制并评估我们能做什么。
了解艺术家如何利用色彩创造情感、深度和意义：从色轮到杰作。
无论你到哪里看,都能找到颜色和形状!这是给小学童的第一堂课。
跟着我们数！这是一个适合小朋友学数字的课程。
大 O 符号描述了算法成本随输入增长而增长的方式。O(N)表示输入翻倍，工作量也翻倍。O(N²)表示输入翻倍，工作量增加四倍。这一课通过编程示例、比较表和实际成本计算来构建大 O 的直觉，然后指向我们深入探讨的课程。
大 O 描述最坏情况增长。Theta 描述紧密的界限。Omega 描述最佳情况。空间复杂性跟踪内存,而不仅仅是时间。按期分析将偶尔的昂贵操作分配给一个序列。这堂课建立了分析任何算法的正式工具集。
A list stores items in order. A set stores unique items for instant lookup. Choosing between them changes your program from O(N²) to O(N). This lesson builds intuition for when to reach for each data structure, how their Big O costs differ, & how to combine them to solve real problems.
算法无处不在：在你如何排序玩具、寻找鞋子，或者快速找出如何先吃掉蔬菜。这个课程在日常生活中找到算法，按颜色和大小排序，并发现有些搜索方式比其他方式更快。
Linear search checks every item one by one. Binary search jumps to the middle & cuts the work in half each time. Bubble sort compares neighbors & swaps them. This lesson builds intuition for why organized data lets computers work faster — with hands-on examples using numbers & words.
解码构建每个活物的分子:从细菌到蓝鲸。
了解情感(高兴、难过、生气、害怕)及如何成为好朋友。
Master fractions through real-world examples: cutting pizza, sharing candy, and building toward algebra.
计算二维形状的面积、立体物体的体积以及在坐标平面上绘制点。
Learn about points, lines, rays, angles, and how to find symmetry in shapes.
探索对称性、类似性、几何变换和三角学的基础。
在周围世界中找到圆、正方形、三角形和长方形。
学习一步一步地解方程:所有更高数学的基础。
Sharpen your mind with the tools philosophers have used for 2,500 years to find truth and spot nonsense.
Understand the building blocks of every song ever written: from Bach to Beyonce.
了解一下你的神奇身体!从你的头到你的脚尖,以及中间的所有部位。
了解控制从落下的苹果到轨道行星的一切的三个定律。
了解食物在你体内所做的，以及最佳饮食的原因比互联网让人觉得简单得多。
Learn to argue like a lawyer and write like a journalist: the art of changing minds with words.
探索大陆漂移、山脉升高、地震震荡和火山喷发的原因：地球之下的引擎。
Read and analyze Robert Frost's classic poem about choices and their consequences.
了解运气背后的数学：从硬币翻转到扑克游戏再到预测天气。
探索记忆与遗忘的科学,了解你的大脑既令人惊叹又不尽可靠
探索一项2,500年前就出现的公式，将几何学与现实世界相连接：从建筑到GPS。
Write your first Python programs: print, variables, input, and logic.
Master the recorder family, transposition, ensemble reading, Baroque ornamentation, and tuning, then carry that musicianship straight into a concert band woodwind section.
Learn to hold a recorder, blow gentle warm air, and play your first three notes: B, A, and G.
Master the soprano recorder's full range, cross-fingering, articulation, breath, and the creeping accelerando of Grieg's 'In the Hall of the Mountain King'.
High and low, loud and soft, a steady beat, and gentle warm air: a first music lesson for little learners, getting ready to play the recorder.
Confront the most famous question in literature: and discover why a 400-year-old play still speaks to us.
了解支配每个价格的不可见力量：从运动鞋到流媒体订阅。
Understand the document that created a government & the amendments that keep it alive 230+ years later.
Sun, rain, snow, and wind! Learn about weather and the four seasons.
探讨决定人类历史上最大规模冲突的关键时刻,以及它留下的世界。