By the Numbers
Hannah RitchieUsing data and research to understand what really makes a difference
| Platform |  | Pricing | Only free issues | Publishes | Weekly |
|---|---|---|---|---|---|
| Issues | 156 | Founded | 4 years ago | Last Issue | 15 days ago |
| Active | |||||
Read this Newsletter
hannahritchie.substack.comLatest Issues
How much electricity does AI consume? [2025 summary]
Over the past year, I’ve written a few articles about the energy (and carbon) footprint of individual use of artificial intelligence, mostly in the form of asking LLMs (or chatbots) questions.
The problem is that until recently, the latest...
Receiving the Unwin Award
A very short post today.
Last week I was in London for the Unwin Award Ceremony. It was held at the Royal Institution. Special as it’s where they’d host the infamous Science Christmas Lectures I watched as a kid on television.
I was one o...
Are only one-third of Britain’s railways electric?
Over the last few years, I’ve seen numerous graphics and social media posts similar to the ones below. They show what share of different countries’ railway lines are electrified. Most of the rest run on diesel.
The focus of the post is alw...
An end to cervical cancer is possible
We all have those moments in life where something clicks. A few years ago, I had mine when I realised that many cancers are caused by infections.
Before then, I had what I’d guess is the common understanding of how cancers form and spread....
The UK is cutting its aid budget to the lowest level in decades
Cuts to USAID have received a decent amount of public attention over the last year.
Understandably so: the United States is the world’s largest aid donor in pure dollar terms (even though it’s far down the list when compared to the size of...
Audience Metrics
Subscribers, engagement, traffic and sponsorship for By the Numbers.
| Subscribers | Engagement | 84 | Monthly Web Visits | ||
|---|---|---|---|---|---|
| Accepts Sponsors | Estimated Cost per Ad | ||||
SEO Reach
Where By the Numbers ranks on Google, and how much search traffic it brings in.
| Ranked Keywords | 3.9k | Monthly Search Traffic | Top Keywords |
|---|
Chart Rankings
How this newsletter ranks in the official Substack charts.
| #9 |
Authors
The writers behind this newsletter.
Social
Frequently Asked Questions
How can I access the email archive for By the Numbers?
You can find recent issues that have been published by By the Numbers on Reletter by scrolling up to where it says Latest Issues. Tap on the link for any of the most recent emails or hit More Issues to see older ones.
How many subscribers does By the Numbers have?
To see how many people subscribe to By the Numbers, simply upgrade your Reletter account. We provide readership numbers and lots of other stats for this newsletter so you can decide if it's worth reaching out to.
How can I advertise in By the Numbers?
Newsletter advertising can be extremely effective when it's done right. Before you pitch By the Numbers as a potential sponsor or partner, make sure that you've done your research and checked its newsletter stats with Reletter.
Then, personalize one of our winning pitching templates and send it to the right person using the contact info provided.
How much does it cost to sponsor a publication like By the Numbers?
Newsletter ad rates (or CPM) vary depending on many factors, including industry, number of subscribers, open rate, ad placement and more.
To find out how much an ad will cost, contact By the Numbers using the contact information provided and ask for a copy of their media kit.
How can I find newsletters related to By the Numbers?
Scroll up to where it says Related Newsletters to see other publications like By the Numbers. You can also search our email newsletter directory to discover other newsletters that cover the topics you're interested in.
How do I contact By the Numbers?
Reletter provides this newsletter's website URL above, where you will often find their contact information. We also provide links to associated social media accounts and pitching templates so you can reach out fast.