Chart assignment

Charts to read and discuss

Read each chart, then answer its questions. Every chart shows its source and date; open it for a table of the numbers and the data to download.

  1. How serious are food recalls?
  2. Where does US electricity come from?

Chart 1 of 2 · Food and drug safety

How serious are food recalls?

The interactive chart needs JavaScript. The numbers are on the chart's page.

Of the 7,081 food recalls the FDA classified from 2013 through 2025, 2,885 (about 41%) were Class I, meaning the food could cause serious harm or death, as with Listeria, Salmonella or an allergen missing from the label. 3,616 (51%) were Class II, and 580 (8%) Class III, unlikely to harm anyone. A recall with products in several classes counts in its most serious one. Meat, poultry and most egg products are USDA's to recall and aren't included.

Questions to discuss

  1. In one sentence of your own, what does this chart show?
  2. Find the biggest change or difference in the chart. What might explain it?
  3. Who collected these numbers, and how recent are they? What else would you want to know before drawing a conclusion?

Source: U.S. Food and Drug Administration, Enforcement Reports (openFDA food recall data) (Public domain (U.S. government work); source U.S. Food and Drug Administration, openFDA) · Data as of Dec 31, 2025

Open the chart and its numbers

Chart 2 of 2 · Energy

Where does US electricity come from?

The interactive chart needs JavaScript. The numbers are on the chart's page.

In 2025 natural gas made 40.8% of US electricity, followed by nuclear (17.7%) and coal (16.6%). Wind made 10.5% and solar 6.7%. Solar counts only utility-scale plants, not rooftop panels, and the 2025 figures are preliminary.

How to read this chart

Each bar is one energy source's share of all the electricity made in the U.S. in a year, so the bars add up to about 100%. The bars start at zero, so a bar twice as long means twice the share. Solar counts only large power plants, not panels on rooftops.

Questions to discuss

  1. Which source makes the most electricity? About how many times more than the smallest bar?
  2. Which of these sources burn fuel and which don't? What share of electricity comes from each group?
  3. Why might a chart of this kind look different in your state than for the whole country?

Source: U.S. Energy Information Administration, Monthly Energy Review (Table 7.2a) (Public domain (U.S. government work)) · Data as of Dec 31, 2025

Open the chart and its numbers

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