What is the male vs female grip strength difference?

Grip strength is one of the factors measured in the National Health and Nutrition Examination Survey (NHANES). Grip strength, which is formally tested by gripping a dynamometer, is also a proxy measurement for upper body and total strength. The median summed (right plus left hand) female grip strength is 64% of the median summed male grip strength. Measures of central tendency do not tell the whole story, and we can see from the distribution that relatively few females exceed the male median. In fact, just 17 of the 2,515 females, or less than 0.1%, have a summed grip strength greater than the median summed grip strength of males. Read more about this on my substack Briefed by Data,
Female vs Male Grip Strength, where I include links to the data and two other graphs.

See Briefed by Data for other articles.

How hot was June 2023?

From NOAA’s June 2023 Global Climate Report:

June 2023 set a record as the warmest June for the globe in NOAA’s 174-year record. The June global surface temperature was 1.05°C (1.89°F) above the 20th-century average of 15.5°C (59.9°F). This marked the first time a June temperature exceeded 1°C above the long-term average.

By definition we don’t officially know if June 2023 was an El Niño month (hence the black bar in the graph) but it was emerging and likely will be one. More about June 2023 on my Briefed by Data site.

Do you need a calculus textbook?

This post is really an ad for my new calculus textbook. I just received my author copies and thought I should promote it. For those that follow sustainabilitymath or use any of the calculus projects know that I’ve integrated many of them into the book. I also integrate R from the beginning so that students can tackle more real world problems and learn a little coding.

If you like data based articles check out my other site on substack: Briefed  by Data

How much does seasonal solar generation vary?

This is from my Briefed by Data post Seasonal Solar Electricity Generation. It looks like the difference between the maximum month and minimum months of solar electricity generation are growing. In fact, it is fairly consistent in terms of a percentage drop.

In Figure 2, we can see that the annual seasonal drop has averaged 56%, but it’s possible that this number is inflated because 2011 and 2012 had higher values. Since 2018, the drop has been extremely stable, staying between 50% and 55% of the previous level.

There is another graph and a reference to the data. Click the article link or visit the main page of Briefed  by Data. Also on twitter @BriefedByData.

Will you have enough electricity this summer?

The map says it all from the eia article Two-thirds of North America is at risk of energy shortfalls in high summer heat, NERC says (6/26/2023).

If temperatures spike this summer, parts of the United States could face electricity supply shortages as demand for cooling increases, according to analysis by the North American Electric Reliability Corporation (NERC). The latest summer reliability report from NERC warns that two-thirds of North America is at risk of energy shortfalls this summer during periods of extremely high electricity demand.

There is a link to the data on the page.

If you like data based articles check out my other site on substack: Briefed  by Data

What is a duck curve?

From the eia article As solar capacity grows, duck curves are getting deeper in California (June 21, 2023):

As more solar capacity has come online in California, grid operators at the California Independent System Operator (CAISO) have observed a drop in net load (or the demand remaining after subtracting variable renewable generation) in the middle of the day when solar generation tends to be highest. When graphed for a typical day, the pattern created by the midday dip in the net load curve, followed by a steep rise in the evenings when solar generation drops off, looks like the outline of a duck, so this pattern is often called a duck curve. As solar capacity in California continues to grow, the midday dip in net load is getting lower, presenting challenges for grid operators.

Two challenges with solar energy:

The first challenge is grid stress. The extreme swing in demand for electricity from conventional power plants from midday to late evenings, when energy demand is still high but solar generation has dropped off, means that conventional power plants (such as natural gas-fired plants) must quickly ramp up electricity production to meet consumer demand.

The other challenge is economic. The dynamics of the duck curve can challenge the traditional economics of dispatchable power plants because the factors contributing to the curve reduce the amount of time a conventional power plant operates, which results in reduced energy revenues. If the reduced revenues make the plants uneconomical to maintain, the plants may retire without a dispatchable replacement. Less dispatchable electricity makes it harder for grid managers to balance electricity supply and demand in a system with wide swings in net demand.

There are links to the data.

If you like data based articles check out my other side: Briefed  by Data


How hot was May 2023?

From the NOAA May 2023 Global Climate Report:

May 2023 was the third-warmest May for the globe in NOAA’s 174-year record. The May global surface temperature was 0.97°C (1.75°F) above the 20th-century average of 14.8°C (58.6°F). The past nine Mays have ranked among the 10 warmest on record. May 2023 marked the 47th consecutive May and the 531st consecutive month with global temperatures, at least nominally, above the 20th-century average.

Note that May wasn’t far off a record. This shouldn’t be a surprise because

Global ocean surface temperature hit a record high for May, which marks the second-consecutive month where ocean surface temperatures broke a record. On June 8, NOAA’s Climate Prediction Center announced an El Niño Advisory alert status; weak El Niño conditions emerged in May as above-average sea surface temperatures strengthened across the equatorial Pacific Ocean. El Niño conditions are now present and are expected to gradually strengthen into the Northern Hemisphere winter 2023–24.

El Niño periods are much warmer. See the Briefed by Data post The Three Trends of Climate Change. The time series data is at the top of the page.

How much propane are we exporting?

From the eia article Monthly U.S. propane exports in March 2023 reached a record high by Josh Eiermann (6/6/2023)

U.S. propane exports reached a record 1.7 million barrels per day (b/d) in March 2023, the highest level since we began collecting this data in 1973. Propane is consumed globally for space heating and is used as a petrochemical feedstock.

The graph shows a noticeable increase to Asia. Why?

U.S. propane exports to Asia have increased rapidly in recent years, driven in part by the region’s increasing demand for propylene, a chemical that can be produced from propane. Propylene is used to manufacture polypropylene, a versatile plastic with many uses, including in car interiors, packaging, and personal protective equipment.

There is one other graph and links to data.