CUBE Chatshaala - Discussion Summary
Today’s ChatShaala session brought together Sailekshmi, Manali Bhujade, Niharika Baghari, Arunan MC, Rechel Tirkey, Aarya Takke, Kiran, and Himanshu Joshi for a session that moved between two connected strands of citizen science: nail growth measurement and a newly introduced onion root tip experiment.
The session opened with a close look at nail anatomy, building on groundwork already familiar to the group from Metastudio’s “Nail Growth: How Do We Measure?” activity. Participants revisited the standard method of tracking growth by marking the nail near the cuticle (historically with voter’s ink, though other markers work equally well) and measuring the distance the mark travels toward the fingertip over time, typically checked in ten-day intervals. The discussion referenced the ImageMeter app as a practical tool for this, since it lets a person draw a line between two points on a photograph and instantly get a length reading, provided a reference scale such as a ruler or graph paper is included in the frame for accuracy.
From there, the conversation moved into finer anatomical detail, distinguishing the proximal and distal ends of the nail. Proximal was defined as the region closer to the point of attachment, near the cuticle and nail matrix, while distal refers to the area farther away, toward the free edge of the nail. The group also worked through dorsal and ventral orientation using the hand itself as a reference, with the back of the hand representing the dorsal side and the palm representing the ventral side. A labelled cross-sectional diagram was used to walk through the deeper structures involved in nail growth, including the matrix (where new nail cells are produced), the proximal fold, eponychium, cuticle, nail plate, nail bed, and hyponychium, giving participants a fuller picture of what lies beneath the visible nail surface.
A concrete case was shared using Sailekshmi’s own data: an ink mark placed on 9 April 2026 was measured again 77 days later, on 25 June 2026, with graph paper used underneath the finger to allow for precise, grid-based measurement rather than relying on a ruler alone. This tied the anatomical discussion directly back to the practical measurement protocol, showing how a mark’s shift from the proximal to a more distal position over time offers a simple, low-cost way to quantify nail growth rate.
The second half of the session introduced a new activity: the Onion Root Tip Experiment. The materials list included four fresh onion bulbs, four transparent glasses, toothpicks (used to suspend the bulbs over the water), and four different water sources for comparison: mineral water, tap water, boiled water, and matka (earthen pot) water. The design suggests a comparative study is planned, likely examining whether root growth rate or root health differs depending on the type of water used, though the specific hypothesis and observation schedule were left open for participants to develop as the activity progresses.
Provocative Questions
-
If nail growth is driven by active cell division at the matrix, what internal or external factors might speed up or slow down that division rate, and could measuring nail growth actually serve as an indirect proxy for a person’s overall metabolic activity?
-
Why might using a graph paper backdrop for measurement, as Sailekshmi did, be more reliable than a ruler alone, and what other low-cost tools could a citizen scientist use to reduce measurement error?
-
Since the ink mark’s position shifts from proximal to distal as the nail grows, what would happen if two people of very different ages recorded the same experiment? Would we expect meaningfully different growth rates, and why?
-
In the Onion Root Tip Experiment, why do you think the design includes four distinct water sources rather than a single control? What differences in mineral content, pH, or microbial load might explain variation in root growth across mineral water, tap water, boiled water, and matka water?
-
Toothpicks are being used to suspend the onion bulbs above the water rather than submerge them; what purpose does this partial contact serve for root development, and what might go wrong if the bulb were fully submerged instead?
-
Could the same graph-paper measurement technique used for nail growth be adapted to track root elongation in the onion experiment, and what would be gained or lost in doing so?
What I Have Learned
This session reinforced how much can be learned from something as commonplace as a fingernail. Before today, I had not fully appreciated the layered structure sitting beneath the visible nail plate, the matrix as the site of active growth, the eponychium and proximal fold providing protective covering, and the hyponychium sealing the space beneath the free edge. Seeing this cross-section alongside the simple proximal-to-distal measurement technique made it clear how rigorous, quantifiable science can emerge from a two-minute daily observation using nothing more than an ink mark and a piece of graph paper.
The 77-day data point shared from personal tracking was a good reminder that citizen science often rewards patience. A single measurement means very little, but a consistent record stretching over months starts to reveal a genuine growth pattern that can be compared across individuals, ages, or even health conditions.
The introduction of the Onion Root Tip Experiment was equally valuable, as it shows how the same spirit of careful, comparative observation extends naturally into plant biology. Using four different water types is a smart way to build a real experimental design with a built-in comparison, rather than a single anecdotal observation, and I am looking forward to seeing how the root growth unfolds across the four conditions.
TINKE Moments (This I Never Knew Earlier)
-
Proximal and distal are relational, not fixed, terms. Several participants initially treated these as fixed anatomical labels, but the session clarified that both terms only make sense relative to a defined point of attachment. On the nail, proximal means nearer the cuticle and matrix, while distal means farther away toward the free edge, the same logic that applies elsewhere in the body.
-
Dorsal and ventral needed a concrete anchor to become intuitive. Rather than memorizing dorsal as “back” and ventral as “front” in the abstract, mapping these terms directly onto the back of the hand versus the palm gave the group an immediate, embodied way to apply the concept, a good example of how anatomical vocabulary sticks best when tied to something tangible.
-
Measurement accuracy depends on having a reference scale in the frame. The group’s past experience with the ImageMeter app revealed that photographs without a ruler, coin, or graph paper alongside the nail produce measurements that cannot be trusted at face value, since there is no fixed unit to calibrate against. This was an important practical lesson carried over to how the current graph-paper method was set up.
-
Experimental design benefits from built-in variation. Rather than treating the Onion Root Tip Experiment as a single demonstration, the choice to run it across four different water types at once shows an emerging appreciation for comparative design, allowing conclusions about water source and root growth to be drawn with far more confidence than a one-off trial would allow.
Gaps and Misconceptions
Despite the productive discussion, a few open gaps remain. The exact hypothesis driving the Onion Root Tip Experiment was not explicitly stated; participants would benefit from a clearer articulation of what outcome is expected and why before observations begin, so that data collection has a clear purpose from day one. Similarly, the observation schedule and specific parameters to be measured for the onion roots (length, number of roots, color, or rate of emergence) were not defined during this session and should be clarified before the next meeting to ensure consistency across the four samples.
On the nail growth side, there remains some ambiguity around how factors such as age, diet, hormonal status, or seasonal variation might influence growth rate, questions that were raised in the original Metastudio thread but not revisited in depth today. Addressing these would strengthen any comparative conclusions drawn from pooled participant data. Finally, while the toothpick-suspension method for the onion bulbs was mentioned, the precise water level relative to the bulb’s base was not specified, and small inconsistencies here across the four glasses could introduce confounding variation unrelated to the water type itself.
Photographs during Chatshaala
Referance